Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas or LP) Zoom

Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas or LP)

SKU:383-500-702

Brand: Weil Mclain

Weil Mclain
383-500-702 has been discontinued.
Direct Replacement:
SKU: 383-500-722
Brand: Weil Mclain
8
1

Specs

Fuel Type: Propane
Natural Gas
Efficiency:
?
95.3%
System Type: Hydronic (Water)
Features: EI/Spark Ignition
Direct Vent
Condensing
Vent Size: 3"
Water Connection: 1"
Gas Connection: 1/2"
BTU Input: 105000
BTU Output: 81000
Warranty: Limited 15 Year Warranty on Heat Exchanger/ 1-year on parts
Width (Inches): 22-13/16"
Vent Type: Direct Vent
PVC
AL29-4C
Boiler Type: High Efficiency

Description for Weil Mclain 383-500-702

**Series 3 Ultra Boiler
Key Features
- Gas fired water boiler with cast aluminum heat exchanger
- Venturi mixing body mixes air and gas providing higher efficiency
- Designed to operate in low temperature condensing applications
- Outdoor reset and domestic hot water priority standard
- Negative regulated gas valve precisely delivers gas to the boiler
- Electronic control module automatically adjusts blower speed and gas flow rate in response to environment
- Modulates with 5 to 1 turndown ratio
- Variable speed motor matches combustion output to heating needs
- High grade stainless steel burner features quiet operation, high efficiency, and cleaner combustion for low NOx applications.

  • Propane Conversion Orifice included for LP Gas Applications

    Hydro-Core Near Boiler Installation Options::
    • FT-144 1" Ultra Component Kit

      PLEASE NOTE: The product weighs 154 lbs. and may require the use of a
      lift gate.
      If you do require a lift gate at your delivery, you'll have the option to add this FREE of charge when you checkout.
  • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas or LP)

    REVIEW SNAPSHOT®

    by PowerReviews
    Weil MclainUltra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)
     
    4.8

    (based on 6 reviews)

    Ratings Distribution

    • 5 Stars

       

      (5)

    • 4 Stars

       

      (1)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

      Cons

        Best Uses

            • Primary use:
            • Personal (6)

          Reviewed by 6 customers

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          5.0

          great product

          By willy

          from northern il

          Verified Buyer

          Pros

            Cons

              Best Uses

                Comments about Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas or LP):

                for basement floor and garage floor it is the best,,, floor heat is the only way to go ,,, love it

                • Primary use:
                • Personal
                 
                4.0

                Good but retailer's price is too high

                By Do-it-all

                from Briarwood, NY

                Verified Buyer

                Pros

                  Cons

                    Best Uses

                      Comments about Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas or LP):

                      This is a good boilers but when things go wrong you cannot purchase parts in local hardware store, you have to purchase via internet. This is my third ultra 105, problems I had was computer and blower goes bad after three years.
                      small price to pay for a low gas bill. I recommend that you do all copper and brass instillation , If something leaks it will be an easy fix.

                       
                      5.0

                      Great

                      By Sammy

                      from Lake George, CO

                      Verified Buyer

                      Pros

                        Cons

                          Best Uses

                            Comments about Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas or LP):

                            I am using this in a home I am building.
                            Found it easy to install.
                            Works just like described.
                            Service was the best.
                            I will purchase from this company again.
                            I will recommend this company to my family, friends, and acquaintances.
                            Fast shipping, too.

                            • Primary use:
                            • Personal
                             
                            5.0

                            great boiler

                            By Dick the Engineer

                            from Oakland, MD

                            Verified Reviewer

                            Pros

                              Cons

                                Best Uses

                                  Comments about Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas):

                                  Have had installed about 3 years. Zero problems. Things to note: with Aluminum heat exchanger,if antifreeze is used, mfr recommends antifreeze specific to alumnimum boilers. I bought Hercules cryo-tek 100/AL on line. Also mfr recommends boiler water ph range 7-8.5. My well water was acidic, i.e. PH between 6-7 so I made a separate closed make up water system and used distilled water from local market. The alternative to a separate system is treating water to bring ph within specified range. My house has some small zones so I opted for Wilo variable speed pump which automatically adjusts flow to the zone size.

                                  • Primary use:
                                  • Personal

                                  (3 of 3 customers found this review helpful)

                                   
                                  5.0

                                  Amazing Boiler

                                  By rickr

                                  from roseburg, or

                                  Verified Buyer

                                  Pros

                                    Cons

                                      Best Uses

                                        Comments about Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas):

                                        The boiler heats my 2700 sq ft house. It started up very well. The diagnostics are great.

                                        I wish it came with more inhibitor. I added it to the system, now I need more to complete the job and can not find out where to get it.

                                        • Primary use:
                                        • Personal

                                        (2 of 2 customers found this review helpful)

                                         
                                        5.0

                                        Ultra 105 boiler

                                        By mike the electrician

                                        from New Jersey

                                        Verified Buyer

                                        Pros

                                          Cons

                                            Best Uses

                                              Comments about Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas):

                                              very good manual, i'm not a plumber by trade but was able to install this boiler.

                                              • Primary use:
                                              • Personal

                                              Displaying reviews 1-6

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                                              Q&A: Ask the Questions, share answers

                                              Do you have questions about this product?

                                              get answers from real customers and in-house experts with AnswerBox.

                                              14 Questions | 26 Answers
                                              Displaying questions 1-10Previous | Next »
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                CAN YOU ADD DOMESTIC HOT WATER SUPPLY
                                                Asked on 3/1/2013 by BRUCE from CHICAGO

                                                3 answers

                                                • VERIFIED BUYER

                                                  A:

                                                  Bruce, I used a boilermate for hot water. indirect fired water heater is
                                                  definitely the way to go.

                                                  Answered on 3/1/2013 by Anonymous
                                                • VERIFIED BUYER

                                                  A:

                                                  Yes, you need an indirect water heater. Directions are with the boiler
                                                  Sent from my iPhone

                                                  Answered on 3/4/2013 by Anonymous
                                                • CUSTOMER CARE

                                                  A:

                                                  You can, but only if you connect the boiler to an indirect water heater.

                                                  Answered on 3/29/2013 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                will you get 95% efficiency if you do not have cast iron baseboards.
                                                Asked on 9/26/2012 by io

                                                2 answers

                                                • VERIFIED BUYER

                                                  A:

                                                  My house has copper with aluminum fin baseboards. I have no idea how to
                                                  measure efficiency but I went from spending $400+ a month for heating oil
                                                  to about $40 a month for my gas bill.

                                                  Answered on 9/26/2012 by Anonymous
                                                • CUSTOMER CARE

                                                  A:

                                                  You can achieve 95% efficiency with this boiler using any type of radiators as long as you operate the boiler at return temperatures that are low enough to allow flue gases to condense and you use an outdoor reset control.

                                                  Answered on 10/5/2012 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                Too many circulators? Ref: Application Guide,#8,pg 24-25. This shows 3 circulators - DWH, System & Boiler. I agree 1 for the system but why 2 additional? My existing separate gas water heater doesn't require a circulator - hot water out is replaced by cold water in. Pressure moves it. The GV90+ boiler,pg 16 says, the internal circulator can be used for multi-zone systems. If the Ultra 105 is is a high efficiency boiler, using 3 circulators doesn't seam too efficient to me. Can you explain this to me please. Thanks, cm
                                                Asked on 9/17/2012 by cm from York, Pa.

                                                2 answers

                                                • VERIFIED BUYER

                                                  A:

                                                  The Ultra has 1 pump for the boiler alone. This pump circulates a "small"
                                                  amount of water through its heat exchanger and can not be used for anything
                                                  else, It has no tank of its own. "IF" you decide to install a domestic hot
                                                  water tank with a coil in it (not gas fed), then you would need 1 pump off
                                                  the ultra to heat it. If you choose to install a gas hot water heater, you
                                                  do not need a pump on the ultra for it.
                                                  Note (1) > You "may" need a circulation pump on a standard gas fired hot
                                                  water heater to keep the water hot in areas located far away from the
                                                  domestic hot water heater. This would basically keep the* domestic hot
                                                  water hot at the tap at all times*. It is a loop back to the gas fired hot
                                                  water heater and has nothing to do with the ultra.
                                                  Note (2) > If you were to install a coil type domestic hot water tank for
                                                  the ultra and you had a situation as explained in Note (1) above, you would
                                                  also need a small domestic hot water circulator to keep the water in those
                                                  remote areas hot. In this instance, you would need a minimum of 3 pumps. 1
                                                  for the ultra heat exchanger, 1 for the domestic hot water tank & 1 to
                                                  circulate the domestic hot water to and from remote locations.
                                                  It is possible to use a "prioritized" zone valve on the coil type domestic
                                                  hot water tank pump from the Ultra to also feed 1 or 2 heat zones (with
                                                  zone valves) in your home depending upon your domestic hot water use. While
                                                  heating water, your home would not be heated in this instance but depending
                                                  upon your hot water use you may not need it to be as it would only be on a
                                                  short time to produce hot water & would switch back to your baseboard zones
                                                  when the domestic hot water demand was met.
                                                  Part of the savings in the ultra is not having a large stagnate water
                                                  storage capacity in the boiler itself. The more water/baseboard you have to
                                                  heat, the more it costs. Therefor he most efficient hot water heaters are
                                                  the at location, on demand type with no storage at all. Unfortunately,
                                                  there is no savings if you need 5 or 6 of these for a large home.

                                                  Answered on 9/18/2012 by Anonymous
                                                • CUSTOMER CARE

                                                  A:

                                                  Condensing boilers like this one require primary/secondary piping. Since they do not hold as much water as standard boilers, there is a large pressure drop. A circulator that solely moves water through the boiler is needed to overcome this drop. The extra circulator will make your electric bill go up, but this increase should be minor when compared to the savings on your gas bill that the boiler will create.

                                                  The third circulator is only necessary if you have an indirect water heater. The purpose of this circulator is not to move domestic water into and out of the tank (water pressure moves it), but to cycle fluid from the heating system through the coil in the indirect tank in order to heat the domestic water.

                                                  Answered on 9/28/2012 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                On a typical boiler, the supply and return lines are seperate. I noticed there is a connection piece between the two, allowing the return flow to mix with the supply flow. Would it not run more efficient if the cool return flow didn't mix with the supply? or is there a specific reason for the connection?
                                                Asked on 6/5/2012 by RGR from NY

                                                6 answers

                                                • VERIFIED BUYER

                                                  A:

                                                  Boilers connected in this way are using a so-called 'primary/secondary' piping design.  In this design style, there is a single piping loop
                                                  (as opposed to two parallel pipes).  A system pump runs fluid through the main loop, then it is up to each 'loop participant' to use their own pump to
                                                  withdraw/return fluid into the loop. The boiler is just another loop participant, extracting cooler fluid, and returning warmer.  Radiators loops do the opposite.
                                                  There are some advantages to this design style, as I've understood.  One big pipe is often cheaper than two. Also, on some boilers the return water must not be too cold, which the single pipe design can help prevent.

                                                  Answered on 6/6/2012 by Anonymous
                                                • VERIFIED BUYER

                                                  A:

                                                  I tried plumbing the way suggested but it would not function properly. The
                                                  water took the path of least resistance and traveled in the very small loop
                                                  instead of feeding the baseboards. I installed a valve in the section
                                                  between the inlet and outlet pipe and have it about 90-95% closed. Has been
                                                  running like this for 2 years with no problems. Gas bill is about $20 a
                                                  month compared to the $400+ a month I was spending on oil. Heater is well
                                                  worth it.

                                                  Answered on 6/5/2012 by Anonymous
                                                • VERIFIED BUYER

                                                  A:

                                                  I am not sure why the engineer designed it that way but that is how you get the most efficency. I connected mine up the way it showed in the manual and absolutely love it. Works great. Had to adjust the settings for my floor application but was easy. Hope this helps.

                                                  Answered on 6/5/2012 by Anonymous
                                                • VERIFIED BUYER

                                                  A:

                                                  If you are talking about the pre formed easy-up manifold kit, from the way
                                                  it was explained to me, the connection between the supply and return was to
                                                  solve a balancing issue with the water pressure. It also means that you
                                                  would have to install 2 pumps, one on the return side and one on the supply
                                                  side. I chose not to install the manifold kit and just installed one pump
                                                  on the return side.

                                                  Answered on 6/5/2012 by Anonymous
                                                • VERIFIED BUYER

                                                  A:

                                                  These types of boilers are usually piped in a configuration called
                                                  "primary-secondary" where there are two loops, one for circulating through
                                                  the radiation and the other for circulating through the boiler. They join
                                                  up at two closely-spaced tees. The reason behind this is that it keeps the
                                                  flow rate through the loops separate. These boilers have a very
                                                  restrictive heat exchanger, and the supplied circulator is designed to
                                                  circulate water through the exchanger at the appropriate rate. If you put
                                                  the boiler in the same loop as the radiation it would be difficult to size
                                                  the circulators properly to maintain flow in the entire system. In
                                                  primary-secondary, you size the circulator(s) for the radiator/convector
                                                  loops so that they circulate at the appropriate flow rate given the design
                                                  temperature and type of radiation. There is the added benefit that when the
                                                  boiler cycles off and the main circulators are still running that no water
                                                  is circulated through the boiler, so you don't lose any heat through the
                                                  boiler.

                                                  Answered on 6/5/2012 by Anonymous
                                                • CUSTOMER CARE

                                                  A:

                                                  This boiler, like most condensing boilers, requires primary/secondary piping to handle the large pressure drop through the unit.

                                                  Answered on 6/5/2012 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                Does the unit come with a hot water coil for domestic water. My current oil burner has a coil.
                                                Asked on 1/16/2012 by Anonymous from Norwalk ct

                                                1 answer

                                                • CUSTOMER CARE

                                                  A:

                                                  This boiler does not come with a coil. You may want to consider Weil-McLain's CGt (NG or LP) or WTGO (oil). These units have an option for a tankless coil.

                                                  Answered on 1/19/2012 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                I am unsure whether the 105 will produce enough heat for my house. I used the BTU calculator but the answer varies from 119,000 to 134,000 btu's if I select or don't select whether the house has had remodeling. What does this mean? My house is 2800 sq ft, is 90 yrs old but very solid full wood construction, has had a few rooms remodeled, has 3 inches of insulation in walls and attic, and has 17 large radiators, and is located in Trenton, NJ. My plumber thinks it's big enough but I am unsure. What is the downside to going to the next larger size boiler? Thanks
                                                Asked on 12/12/2011 by Bob from Trenton, NJ

                                                2 answers

                                                • A:

                                                  The downside is that you might be using more fuel than you need. You should use a heat loss calculator to know exactly how large of a boiler you will need.

                                                  Answered on 12/21/2011 by Anonymous from None
                                                • CUSTOMER CARE

                                                  A:

                                                  The biggest downside to selecting a boiler that's oversized is that you will use more fuel than is necessary to heat your house. If you want to size the boiler accurately, a heat loss calculation (AKA manual J) would be necessary. Our calculator is only meant to provide an estimate.

                                                  Answered on 12/13/2011 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                Is there a relationship with nat. gas btu to oil btu?
                                                Asked on 11/16/2011 by jake from folsom, pa

                                                1 answer

                                                • CUSTOMER CARE

                                                  A:

                                                  Natural Gas - 100,000 BTU per 1 CCF (1 therm). #2 Oil 139,000 BTU per Gallon.

                                                  Answered on 11/21/2011 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                Does the boiler need to be programed by a Weil Mclain tech or can I do it myself?
                                                Asked on 11/13/2011 by Bamma from New Jersey

                                                1 answer

                                                • CUSTOMER CARE

                                                  A:

                                                  We always recommend having a professional installer to install your equipment. However the boiler manual will give detailed directions on boiler control setup.

                                                  Answered on 11/16/2011 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                with the ultra 105 will i need a seprate water heater for the domestic supply?
                                                Asked on 8/11/2011 by Anonymous

                                                1 answer

                                                • CUSTOMER CARE

                                                  A:

                                                  Yes, it would need to be connected to an indirect water heater.

                                                  Answered on 8/11/2011 by PexSupply Staff from NY
                                              • Ultra 105 - 81,000 BTU Output High Efficiency Boiler (Nat Gas)

                                                Q:

                                                does it make a lott of noise?
                                                Asked on 6/26/2011 by joe from ny

                                                1 answer

                                                • CUSTOMER CARE

                                                  A:

                                                  No, this unit is designed to operate quietly.

                                                  Answered on 6/27/2011 by PexSupply Staff from NY
                                              Displaying questions 1-10Previous | Next »

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