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Hydrotherm

KN-Series Condensing Cast Iron Boilers from Advanced Thermal Hydronics (Hydrotherm) are the one and only high efficiency cast iron boiler ever made and offer an industry leading 25 year heat exchanger warranty. KN-Series Boilers combine the efficiency of condensing, gas-fired technology with the strength, durability and heat retention of time-tested cast iron construction. From raw materials to the state-of-the-art digital control system, the complete line of KN-Series products is proudly manufactured at the ATH facility in Boyertown, Pennsylvania. Utilizing decades of foundry and manufacturing expertise, KN-Series boilers are cast, machined, wired and assembled to the tightest standards possible resulting in a finished product that is all-American in terms of innovation, reliability and craftsmanship. Models available from 200,000 - 4,000,000 BTU/h.

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Picture of 50334 HIGH LIMIT (HYDROLEVEL)

50334 HIGH LIMIT (HYDROLEVEL)

HYDROTHERM:50334
SKU: HYDROTHERM:50334
$826.65
Picture of 50343PB LIMIT CONTROL WITH SENSOR, HYDROLEVEL HYDROSTAT 3250

50343PB LIMIT CONTROL WITH SENSOR, HYDROLEVEL HYDROSTAT 3250

HYDROTHERM:50343PB
SKU: HYDROTHERM:50343PB
$826.65
Picture of 50501PB 30 PSI RELIEF VALVE

50501PB 30 PSI RELIEF VALVE

HYDROTHERM:50501PB
SKU: HYDROTHERM:50501PB
$106.43
Picture of 50510PB POP SAFETY VALVE – STEAM

50510PB POP SAFETY VALVE – STEAM

HYDROTHERM:50510PB
SKU: HYDROTHERM:50510PB
$108.90
Picture of 50581 GAS VALVE (NG) CONSTANT

50581 GAS VALVE (NG) CONSTANT

HYDROTHERM:50581
SKU: HYDROTHERM:50581
$391.05
Picture of 50583 GAS VALVE (NG) SPARK

50583 GAS VALVE (NG) SPARK

HYDROTHERM:50583
SKU: HYDROTHERM:50583
$378.67
Picture of 50584 GAS VALVE (LP) SPARK

50584 GAS VALVE (LP) SPARK

HYDROTHERM:50584
SKU: HYDROTHERM:50584
$550.69
Picture of 50587 GAS VALVE (NG) CONSTANT

50587 GAS VALVE (NG) CONSTANT

HYDROTHERM:50587
SKU: HYDROTHERM:50587
$645.97
Picture of 50588 GAS VALVE (LP) CONSTANT

50588 GAS VALVE (LP) CONSTANT

HYDROTHERM:50588
SKU: HYDROTHERM:50588
$325.46
Picture of 50589 GAS VALVE (NG) SPARK

50589 GAS VALVE (NG) SPARK

HYDROTHERM:50589
SKU: HYDROTHERM:50589
$685.58