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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 02-4871 BLOCKED INLET PRESSURE SWITCH

02-4871 BLOCKED INLET PRESSURE SWITCH

HYDROTHERM:02-4871
SKU: HYDROTHERM:02-4871
$59.40
Picture of 02-5206 UV FLAME SENSOR, C7027

02-5206 UV FLAME SENSOR, C7027

HYDROTHERM:02-5206
SKU: HYDROTHERM:02-5206
$247.50
Picture of 02-5210 BLOCKED FLUE SWITCH

02-5210 BLOCKED FLUE SWITCH

HYDROTHERM:02-5210
SKU: HYDROTHERM:02-5210
$24.75
Picture of 02-5838 HYDROTHERM    8 VENT DAMPER REPLACES  02-5855

02-5838 HYDROTHERM 8 VENT DAMPER REPLACES 02-5855

HYDROTHERM:02-5838
SKU: HYDROTHERM:02-5838
$379.91
Picture of 03-00300-001 RELIEF PLATE COVER

03-00300-001 RELIEF PLATE COVER

HYDROTHERM:03-00300-001
SKU: HYDROTHERM:03-00300-001
$19.80
Picture of 03-1811 FILTER BOX COVER

03-1811 FILTER BOX COVER

HYDROTHERM:03-1811
SKU: HYDROTHERM:03-1811
$27.22
Picture of 03-2019 MAIN GAS ORIFICE (NG)

03-2019 MAIN GAS ORIFICE (NG)

HYDROTHERM:03-2019
SKU: HYDROTHERM:03-2019
$14.85
Picture of 03-2020 MAIN GAS ORIFICE (LP)

03-2020 MAIN GAS ORIFICE (LP)

HYDROTHERM:03-2020
SKU: HYDROTHERM:03-2020
$14.85
Picture of 03-2023 MAIN GAS ORIFICE (NG)

03-2023 MAIN GAS ORIFICE (NG)

HYDROTHERM:03-2023
SKU: HYDROTHERM:03-2023
$14.85
Picture of 03-2024 MAIN GAS ORIFICE (LP)

03-2024 MAIN GAS ORIFICE (LP)

HYDROTHERM:03-2024
SKU: HYDROTHERM:03-2024
$14.85