Search

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.

View as Grid List
Sort by
Display per page
Picture of 24V TRANSFORMER

24V TRANSFORMER

HYDROTHERM:GX-82457
SKU: HYDROTHERM:GX-82457
$118.80
Picture of 250VA TRANSFORMER

250VA TRANSFORMER

HYDROTHERM:15-00005-001
SKU: HYDROTHERM:15-00005-001
$262.35
Picture of 25-1118 BURNER ORIFICE #31 NG

25-1118 BURNER ORIFICE #31 NG

HYDROTHERM:25-1118
SKU: HYDROTHERM:25-1118
$6.19
Picture of 25-1132 BURNER ORIFICE #32 NG

25-1132 BURNER ORIFICE #32 NG

HYDROTHERM:25-1132
SKU: HYDROTHERM:25-1132
$6.19
Picture of 25-1134 BURNER ORIFICE #41 NG

25-1134 BURNER ORIFICE #41 NG

HYDROTHERM:25-1134
SKU: HYDROTHERM:25-1134
$6.19
Picture of 25-1136 BURNER ORIFICE #40 (NG)

25-1136 BURNER ORIFICE #40 (NG)

HYDROTHERM:25-1136
SKU: HYDROTHERM:25-1136
$6.19
Picture of 25-1137 BURNER ORIFICE #38 NG

25-1137 BURNER ORIFICE #38 NG

HYDROTHERM:25-1137
SKU: HYDROTHERM:25-1137
$6.19
Picture of 25-1138 BURNER ORIFICE 1.55 MM (LP)

25-1138 BURNER ORIFICE 1.55 MM (LP)

HYDROTHERM:25-1138
SKU: HYDROTHERM:25-1138
$6.19
Picture of 25-1139 BURNER ORIFICE 1.65 MM (LP)

25-1139 BURNER ORIFICE 1.65 MM (LP)

HYDROTHERM:25-1139
SKU: HYDROTHERM:25-1139
$6.19
Picture of 3 FLUE ADAPTER

3 FLUE ADAPTER

HYDROTHERM:56-3346
SKU: HYDROTHERM:56-3346
$285.86