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Bosch Thermotechnology (8)
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Adapter (1)
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Maximum Input Capacity (BTU)
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Maximum Input Capacity (BTU)
The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.
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70000 - 99999 (1)
100000 - 129999 (22)
130000 - 159999 (14)
160000 - 189999 (49)
190000 - 219999 (80)
250000 - 279999 (1)
280000 - 309999 (5)
370000 - 399999 (3)
490000+ (1)
Energy Factor
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Energy Factor
Energy Factor (EF) is a measurement of water heater energy efficiency. The higher the energy factor, the more efficient the water heater.
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0.95 (7)
0.99 (2)
3.06 (1)
3.17 (1)
AFUE (%)
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AFUE (%)
AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace.
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84 (2)
88 (2)
97 (1)
98 (8)
Vent Type
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Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
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Concentric Vent (20)
Direct Vent (89)
Outdoor (No Venting) (63)
Power Vent (4)
Fuel Type
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Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
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Electric (71)
Indirect Fired (40)
Liquid Propane (70)
Natural Gas (106)
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Single-Speed (1)
Three-Speed (1)
Flow Rate at 40F Temperature Rise (GPM)
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Flow Rate at 40F Temperature Rise (GPM)
Flow rate measures how much hot water your heater can deliver. Click Learn More to determine the appropriate temperature rise to use based on your location.
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0 (29)
1 (18)
2 (6)
3 (1)
4 (4)
5 (19)
6 (16)
7 (22)
8 (43)
9 (52)
10 (2)
13 (4)
Product Status
Discontinued (87)
Available (301)
(1)
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Amtrol CH-41Z - 41 Gallon - Indirect Water Heater - Blue
Model: CH-41Z-B
(1)
Q&A
(1)
2% Check Discount
$1,862.00
Free Freight
Free Lift Gate
In-Stock
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Amtrol Therm-X-Span - 4.4 Gallon - In-Line Thermal Expansion Tank
Model: T-12
(1)
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$159.00
Free Freight
Free Lift Gate
In-Stock
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Amtrol Therm-X-Span - 2 Gallon - In-Line Thermal Expansion Tank
Model: T-5
(1)
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$149.99
Free Freight
Free Lift Gate
In-Stock
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Caleffi 3-Way Adjustable Thermostatic Mixing Valve, built-in inlet check valves, 1" Sweat
Model: 252169A
(1)
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$183.09
Free Shipping
Factory-Direct!
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Taco 00 Series - Aquastat
Model: 563-2
(1)
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$55.39
Free Shipping
In-Stock
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Taco 00 Series - Digital Timer
Model: 265-3
(1)
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$192.10
Free Shipping
In-Stock
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Taco 006 - Plumb N' Plug - 1/40 HP - Circulator Pump - Bronze - Analog Timer - 1/2" Sweat
Model: 006-BC4-PNP
(1)
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$511.44
Free Shipping
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Taco 006 - Plumb N' Plug - 1/40 HP - Circulator Pump - Bronze - Digital Timer - 3/4" Sweat
Model: 006-B4-2PNP
(1)
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$526.32
Free Shipping
Only 2 In-Stock
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Grundfos 7/8" Piping - Aquastat Kit - 105-115 Degrees F - 3/4" Clip-on Mount
Model: 595657
(1)
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$62.00
Free Shipping
In-Stock
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Grundfos Date Codes 0528 - Present - Programmable Timer - Single Speed
Model: 599388
(1)
Q&A
(1)
$104.00
Free Shipping
In-Stock
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Burnham AL27SL - 27 Gallon - Indirect Water Heater
Model: AL27SL
(1)
Q&As
(2)
2% Check Discount
$1,631.76
Free Freight
Free Lift Gate
Factory-Direct!
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Burnham AL50SL - 50 Gallon - Indirect Water Heater
Model: AL50SL
(1)
Q&As
(3)
2% Check Discount
$1,922.84
Free Freight
Free Lift Gate
In-Stock
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Burnham AL70SL - 70 Gallon - Indirect Water Heater
Model: AL70SL
(1)
Q&As
(3)
2% Check Discount
$2,503.14
Free Freight
Free Lift Gate
Only 5 In-Stock
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Amtrol Therm-X-Trol - 10.3 Gallon - Vertical Thermal Expansion Tank
Model: ST-25V
(1)
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$306.00
Free Shipping
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Amtrol Therm-X-Trol - 14 Gallon - Vertical Thermal Expansion Tank
Model: ST-30V
(1)
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$381.00
Free Shipping
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Amtrol Therm-X-Trol - 20 Gallon - Vertical Thermal Expansion Tank
Model: ST-42V
(1)
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$458.00
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Amtrol Therm-X-Trol - 4.4 Gallon - In-Line Thermal Expansion Tank
Model: ST-12
(1)
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$91.00
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Amtrol Therm-X-Trol - 44 Gallon - Vertical Thermal Expansion Tank
Model: ST-80V
(1)
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$802.00
Free Freight
Free Lift Gate
Factory-Direct!
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Amtrol Therm-X-Trol - 62 Gallon - Vertical Thermal Expansion Tank
Model: ST-180V
(1)
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$935.00
Free Freight
Free Lift Gate
Factory-Direct!
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Takagi Pipe Cover for Tankless Water Heaters
Model: 100112718
(2)
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$150.00
Free Shipping
Factory-Direct!
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Rheem RTG - Residential 199,900 BTU - Natural Gas Tankless Water Heater - Outdoor
Model: RTG-95XLN
(2)
Q&A
(1)
2% Check Discount
$1,243.00
Free Shipping
In-Stock
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Takagi TK-540P-NIH - Residential 199,000 BTU - Natural Gas Tankless Water Heater - Indoor
Model: TK-540P-NIH
(29)
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2% Check Discount
$1,415.95
Free Shipping
Factory-Direct!
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Noritz NR98 - Residential 199,900 BTU - Liquid Propane Tankless Water Heater - Power Vent
Model: NR98-SV-LP
(9)
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2% Check Discount
$1,444.96
Free Shipping
In-Stock
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Noritz EZTR75 - Residential 199,900 BTU - Natural Gas Tankless Water Heater - Indoor (Bundle Pack)
Model: EZTR75-NG
(6)
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Offer Ends Saturday, December 21
2% Check Discount
$2,363.65
$2,127.30
Free Freight
Free Lift Gate
Factory-Direct!
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