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008 Variable Speed Delta-T Cast Iron Circulator Pump, 1/25 HP
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008-VDTF6 has been discontinued
Discontinued October 4, 2019
This product was discontinued by the manufacturer.
MANUALS (3)
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Direct Replacement:
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Product Highlights
–
115V
1/25 HP
3 Year Warranty
Flanged x Flanged Connection
15 MAX GPM
125 MAX PSI
Description
–
Note: Full flange-to-flange three-year warranty on all 00 Series circulators.
Taco Variable Speed Delta-T Circulator's all-in-one design combines a microprocessor based variable speed differential controller with the reliability and convenience of our 00® Cartridge Circulators. Simply dial in the design Delta-T of the system or zone (from 5 - 50°F) and then sit back and watch the circulator automatically adjust its performance to match the systems ideal BTU/hr output, while conserving energy and eliminating velocity noise.
No matter how good your original system design and heat loss calculations were, they included estimates and rules of thumb. What are the design conditions for those systems you "inherited" or have to service? Have a zone valve system or multi-zone radiant manifolds running off a common circulator? Your system needs a circulator that automatically adjusts to deliver the optimal heat transfer based on the actual operation of the system, every day, under all load conditions - even when those conditions change. With the Taco Variable Speed Delta-T 00® Circulators you simply dial in your desired temperature drop across the system or zone (5-50°F), attach a supply and return sensor directly to the pump and it will automatically vary its performance to deliver optimal heat, efficiency and comfort.
Features:
Replacement Parts List:
Casing O-Ring: 008-005RP
Flange Gasket Set: 007-007RP
Cartridge Assembly Complete: 008-044RP
Taco Variable Speed Delta-T Circulator's all-in-one design combines a microprocessor based variable speed differential controller with the reliability and convenience of our 00® Cartridge Circulators. Simply dial in the design Delta-T of the system or zone (from 5 - 50°F) and then sit back and watch the circulator automatically adjust its performance to match the systems ideal BTU/hr output, while conserving energy and eliminating velocity noise.
No matter how good your original system design and heat loss calculations were, they included estimates and rules of thumb. What are the design conditions for those systems you "inherited" or have to service? Have a zone valve system or multi-zone radiant manifolds running off a common circulator? Your system needs a circulator that automatically adjusts to deliver the optimal heat transfer based on the actual operation of the system, every day, under all load conditions - even when those conditions change. With the Taco Variable Speed Delta-T 00® Circulators you simply dial in your desired temperature drop across the system or zone (5-50°F), attach a supply and return sensor directly to the pump and it will automatically vary its performance to deliver optimal heat, efficiency and comfort.
Features:
- All-in-One Pump & Control
- Sensors Included
- Easy to Install: attach 2 Sensors, dial in the Desired Delta-T
- UL Approved
- Snap-in PC Board, replaceable
- LED Status Panel
- Fuse Protected
- Plug-in Low Voltage Wiring Terminal
- Optional Integral Flow Check (IFC®)
- Increases System Efficiency
- Pump Always Runs at Minimum Required Speed
- Eliminates Velocity Noise
- Eliminates Need for a Pressure By-pass Valve
- Conserves Energy
- Achieves System Design Goals, even when Installed System Varies from Original Design
- Pump Automatically Adjusts to Current System Conditions
- Spend Less Time Figuring Out Pressure Drop (for proper pump sizing) when Servicing Existing Systems.
- Pump Exercise
- Delivers Ideal BTU/hr Heat Transfer for All Styles of Emitters
Replacement Parts List:
Casing O-Ring: 008-005RP
Flange Gasket Set: 007-007RP
Cartridge Assembly Complete: 008-044RP
Specs
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| Application: | Heating |
|---|---|
| Type: | Var. Speed Pump |
| Material: | Cast Iron |
| Horse Power: | 1/25 |
| Voltage: | 115V |
| Phase: | 1 |
| Hertz: | 60 |
| Amperage: | 0.79 |
| Max Flow (GPM): | 15 |
| Flow Range (GPM): | 0-15 |
| Max Head (Ft): | 15 |
| Head Range (ft.): | 0-15 |
| RPM: | Variable |
| Max Pressure (PSI): | 125 |
| Connection Type: | Flanged x Flanged |
| Connection Size: | 3/4" 1" 1-1/4" 1-1/2" |
| Warranty: | 3 Year |
Contact
+
Happy Independence Day!
Our Customer Support will be closed today in honor of Independence Day. We will be back tomorrow to answer your questions.
Call or text 888-757-4774
Special Hours
Closed Now
Monday – Thursday
8am–7:45pm
Friday
9am–7:45pm
Saturday – Sunday
9am–5:45pm
4 Replacement Parts
Sleeve Gasket, 920-007RP
SKU: 920-007RP
Taco
Need help finding a replacement part?
Fill out the part request form and someone will get back to you shortly.
PART REQUEST FORM
Product Reviews
4.75 out of 4 reviews
100% would recommend this product
5 star
75%
4 star
25%
3 star
0%
2 star
0%
1 star
0%
Showing 1-4 of 4 reviews
Pay attention to flange orientation
Pay attention to flange orientation when ordering this in a replacement scenario. It will save you some installation grief. Very satisfied with the pump.
Nigel
South East PA
11 years ago
Verified Buyer
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Great for heated floor
This is the perfect setup for my heated floor system. Having the built-in delta T sensors and controls means I only need to give this power and I'm good to go.
Cold Engineer
Columbus, IN
12 years ago
Verified Buyer
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EFFECIENT!
The only pump to use in heated floors!
Stop using mixing valves.
Absolutely the best pump for use with geothermal systems.
JM
Markleysburg, Pa
14 years ago
Verified Buyer
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Taco 008 Delta T variable speed pump
I have a 4 zone baseboard hydronic system with one circulator. When I replaced my old boiler with a modern triple pass low mass Biasi boiler I decided to use this pump to help keep cold return temperatures from harming the boiler and to modulate flow when different zones are calling according to the delta T of the system. It has been installed for several months, and seems to be working great. I set the Delta T at 20 degrees F and it seems to be happy there. I read other reviews elsewhere that complained about strange noises from the pump and water velocity noise but I have not experienced any of this. The house heats evenly and quietly.
jaybird396
SE Mass
16 years ago
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Product Q&A
6 Questions6 Questions
Q: I have a cast iron boiler and cast iron radiators on two floors. I was wondering if (these variable speed pumps that can adjust flow rates by monitoring delta t) could be used as the only pump in the system. Also, would they help reduce short cyclying due to oversized boiler.
Asked by eric 12 years ago
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Verified Reply- Supplyhouse Staffno they can not
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Q: Does the pump include the 2 temperature sensors?? If not what is the recommended sensor to use?
Asked by Bob 12 years ago
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Verified Reply- SupplyHouse StaffThe supply and return sensors are included with the pump.
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Q: Boiler: Peerless Purefire 110 Heating zones:3 DHW: Turbomax 33 Total Baseboard: 130 feet I need one pump for each zone, one for DHW, and one for the boiler: What pumps do I need to handle this? 4 taco 007 and 1 008?
Asked by Zeke 15 years ago
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Verified Reply- PexSupply StaffThat will be based on gpm and head pressure for each zone.
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Q: I have a five zone system, where three zones, on the first floor, are radiant heat using 1/2" pex tubing. The two remaining zones are 3/4" copper fin tube baseboard heat. These last two zones are located on the second floor of my home. There are never more than three zones operating at any one time. The Weil McLain Ultra High Efficiency boiler is located in the basement. At present, we have a Taco 008 single speed circulator. We are experiencing velocity noise. WILL THIS PUMP HANDLE OUR SYSTEM? I would calculate the head at 12 feet maximum, from the pump location to the uppermost fin tube radiation.
Asked by Dan 15 years ago
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Verified Reply- PexSupply StaffThis pump should be the right choice, as long as it meets you GPM and head pressure requirements.
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- Greenman
My guess is that the VDT-008 will "handle your system". The single speed 008 has more than enough speed to handle your system since you are getting velocity noise, so I assume the variable speed version has the same capacity at its high speed. But please see my review of this pump. Mine makes a rather loud electrical hum noise whenever it is running at a speed below full speed. We can hear this hum throughout the house and it is not acceptable. I am trying to find out whether I have a bad unit, or whether they all make this noise. I found one other reference to this noise on the internet. The alternatives which are said to be silent are the Grundfos Alpha and Wilo Stratos which are both variable speed delta P circulators. They use delta P rather than delta T as their control strategy, but I don't think there will be a huge difference in the overall electrical and heating efficiency. They are similar cost as the Taco.
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Q: I currently have a five zone system. The first floor zones are radiant heat with 1/2" PEX tubing. The second floor has the two remaining zones, which are 3/4" copper fin tube baseboard convectors. At any one time, no more than two zones are operating. My boiler is a Weil McLain Ultra high efficiency model. The present Taco pump is a 008 single speed model which, when operating, causes noise in the system. I am told that this is velocity noise. Would this model be the best choice to reduce noise?
Asked by 15 years ago
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Verified Reply- PexSupply StaffYes, this pump will help minimize noise and make your system run more efficiently.
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Q: I am making changes to my existing zone valve system to add a low temp system (currently 6 zones). my current pump is a 3 speed circulator (Astro30). My longest run calculates to approx 10.4ft of head. Would a variable speed pump be a good option and given the head, would the 008 be a better option than the 007 or 010? my max flow target flow is 10.3gpm
Asked by steve 15 years ago
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Verified Reply- PexSupply StaffThis circulator will not deliver 10.3 GPM at 10.4 ft of head. You would need to look at the Taco 0014-VDTF1.
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