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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 #6 X 1/2” BLK SCREW

#6 X 1/2” BLK SCREW

HYDROTHERM:57-3413
SKU: HYDROTHERM:57-3413
$1.24
Picture of #67 LWCO

#67 LWCO

HYDROTHERM:21-2060
SKU: HYDROTHERM:21-2060
$608.85
Picture of #751 LWCO LESS CASE (AS OF 0117)

#751 LWCO LESS CASE (AS OF 0117)

HYDROTHERM:14-00202-001
SKU: HYDROTHERM:14-00202-001
$447.97
Picture of #751 LWCO MANUAL RESET WITH PROBE (PRIOR TO 1216)

#751 LWCO MANUAL RESET WITH PROBE (PRIOR TO 1216)

HYDROTHERM:14-00201-001
SKU: HYDROTHERM:14-00201-001
$447.97
Picture of 01-00051-001 3 SUPPLY & RETURN CASTING

01-00051-001 3 SUPPLY & RETURN CASTING

HYDROTHERM:01-00051-001
SKU: HYDROTHERM:01-00051-001
$74.25
Picture of 01-00052-001 4 SUPPLY & RETURN CASTING (PRIOR TO 0816)

01-00052-001 4 SUPPLY & RETURN CASTING (PRIOR TO 0816)

HYDROTHERM:01-00052-001
SKU: HYDROTHERM:01-00052-001
$350.21
Picture of 01-00054-001 4 SUPPLY & RETURN CASTING (AFTER 0916)

01-00054-001 4 SUPPLY & RETURN CASTING (AFTER 0916)

HYDROTHERM:01-00054-001
SKU: HYDROTHERM:01-00054-001
$128.70
Picture of 01-1627-1 REAR SECTION

01-1627-1 REAR SECTION

HYDROTHERM:01-1627-1
SKU: HYDROTHERM:01-1627-1
$1,089.00
Picture of 01-1628 MIDDLE SECTION

01-1628 MIDDLE SECTION

HYDROTHERM:01-1628
SKU: HYDROTHERM:01-1628
$991.24
Picture of 01-1629 FRONT SECTION

01-1629 FRONT SECTION

HYDROTHERM:01-1629
SKU: HYDROTHERM:01-1629
$1,054.35