40 Gallon, Squire SIT040 Indirect Water Heater Zoom

40 Gallon, Squire SIT040 Indirect Water Heater


Brand: Lochinvar

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(3 Available)


BTU Input: 115000
Capacity (Gallons): 40
Water Connection: 1"
Height (Inches): 55.5
Diameter (Inches): 20"
1st Hour Delivery (Gallons): 208
Weight (lbs): 105 lbs
Application: Plumbing
Material: Stainless Steel
Boiler Return: 1"
Boiler Supply: 1"
Flow Rate (GPM): 14 GPM
Warranty: 5 Year Limited Tank/ 1 Year on Parts

Description for Lochinvar SIT040

**NOTE: Compatible Honeywell L4006A1967 Aquastat Controller available

The Squire uses the power and efficiency of the boiler that heats the home to generate domestic hot water for showers, dish washing, clothes washing - any hot water demand required. The efficiency of the boiler used to heat the home can be as much as 20% higher than a direct-fired tank-type water heater. So why not use that efficiency to "indirectly" provide hot water for all domestic applications?

The Squire passes the boiler water used to heat the home through a uniquely designed internal helical coil that is immersed in the water heater tank. The super heated coil then passes its energy directly to the potable water. The end result is hot water for domestic use from boiler water already being used to heat the home. By using the Squire, to indirectly heat the domestic water, you eliminate the additional gas line, electrical connections and vent ducts needed with direct-fired tank-type water heaters.


  • Fully Welded Construction
  • 100% Stainless Steel Construction
  • Built in U.S.A. at Lochinvar World Headquarters
  • 316L Passivated Stainless Steel Tank
  • 304L Stainless Steel Heating Coil
  • 1" Boiler Supply and Return Connections
  • 1" Domestic Water Connections (30, 40, 50 models)
  • 1-1/2" Domestic Water Connections (65, 80, 119 models)
  • Non-HCFC High Density Foam Insulation
  • Temperature and Pressure Relief Valve (Shipped Loose)
  • Factory Supplied Tank Sensor
  • 5 Year Limited Tank Warranty on all models used in a commercial application.
  • One Year Warranty on parts (see warranty PDF for details)

PLEASE NOTE: The product weighs 105 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.

40 Gallon, Squire SIT040 Indirect Water Heater

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4 Questions | 5 Answers
Displaying questions 1-4
  • 40 Gallon, Squire SIT040 Indirect Water Heater


    how does the hot water heater turn on the furnace. My furnace runs about 10 minutes every hour during the summer when no heat is required. This is even at midnight when no hot water has been used in several hours.
    Asked on 8/23/2012 by Joe craven from new boston, nh

    2 answers



      Hi Joe
      There is a well in the side of the tank where you can insert an aquastat
      that in turn gets connected to your boiler. You will likely need to add a
      zone and pump to your boiler to do this. Incidentally an even better way to
      make hot water is a solar system that uses what are known as evacuated tubes
      to heat your water. I recently added such a system at my house because of
      the same problem with the boiler running all summer to heat water. Got to
      love those tankless heaters. My system has 60 evacuated tubes installed on
      the roof and a 119 gallon stainless water heater. (Should last forever) The
      water heater has two coils, one in the bottom of the tank and one at the
      top. Hot antifreeze from the roof collector circulates though the bottom
      coil when the temperature of the collector on the roof is 10 degrees warmer
      than the tank. The upper coil is used for make up when the sun is not
      shining. Make up heat comes from the boiler in the same way it would if
      there was no solar collector. Google "solar hot water heaters" there is a
      ton of information out there to be had. By the way my boiler shuts down
      after the heating season is over and almost never runs all summer. The only
      exception is if there is no sun for several days in a row. There are also
      tax rebates from the federal government and many states have incentive
      programs to help pay for the system.
      Hope this helps

      Answered on 8/24/2012 by Anonymous


      There should be a thermostat in the side of the tank that's wired to the furnace. If the temperature inside the tank drops too much it will kick on the furnace. If you have a knight boiler you should be able to adjust the water temperature

      Answered on 8/25/2012 by Anonymous
  • 40 Gallon, Squire SIT040 Indirect Water Heater


    I am planning on using this for hot water to a sink in a bathroom, a clothes washer, a sink in a kitchen, and a dishwasher. What size pipe to my boiler should I use? Does it matter if I use PEX-A or PEX-B oxygen free tubing?
    Asked on 2/27/2012 by John

    1 answer



      You would want to use oxygen-barrier PEX to connect this unit to the boiler. You can use either PEX-A (which is more flexible) or PEX-B. You'll generally want to use 1" tubing to connect with the boiler.

      Answered on 3/16/2012 by PexSupply Staff from NY
  • 40 Gallon, Squire SIT040 Indirect Water Heater


    This product comes with a 5 year commercial warranty. Whats the warranty for residential usage?
    Asked on 8/2/2011 by Anonymous

    1 answer

  • 40 Gallon, Squire SIT040 Indirect Water Heater


    Does this qualify for an energy tax credit?
    I bought one in December of 2010.
    Asked on 3/17/2011 by Anonymous

    1 answer



      Indirect water heaters themselves do not qualify because their energy efficiency ratings are dependent on those of the boilers they are connected to. If you purchased your boiler last year, it may qualify.

      Answered on 3/18/2011 by PexSupply Staff from NY
Displaying questions 1-4

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