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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 GAS MANIFOLD

GAS MANIFOLD

HYDROTHERM:50980
SKU: HYDROTHERM:50980
$136.13
Picture of HIGH LIMIT AQUASTAT (AUTO RESET)

HIGH LIMIT AQUASTAT (AUTO RESET)

HYDROTHERM:14-00053-001
SKU: HYDROTHERM:14-00053-001
$134.89
Picture of 100 PSI RELIEF VALVE

100 PSI RELIEF VALVE

HYDROTHERM:22-1808
SKU: HYDROTHERM:22-1808
$133.65
Picture of 5K RESISTOR

5K RESISTOR

HYDROTHERM:58-1831
SKU: HYDROTHERM:58-1831
$133.65
Picture of PILOT (LP) SPARK

PILOT (LP) SPARK

HYDROTHERM:50997PB
SKU: HYDROTHERM:50997PB
$132.41
Picture of 10K OUTDOOR PROBE

10K OUTDOOR PROBE

HYDROTHERM:GX-81027-1
SKU: HYDROTHERM:GX-81027-1
$131.18
Picture of FLAME ROD

FLAME ROD

HYDROTHERM:GX-82762
SKU: HYDROTHERM:GX-82762
$131.18
Picture of CC TO BURNER GASKET KITS

CC TO BURNER GASKET KITS

HYDROTHERM:75-00580-001
SKU: HYDROTHERM:75-00580-001
$131.18
Picture of FLANGE, SHUT OFF SWIVEL

FLANGE, SHUT OFF SWIVEL

HYDROTHERM:12-00301-005
SKU: HYDROTHERM:12-00301-005
$129.94
Picture of 4 SUPPLY & RETURN CASTING (AFTER 0916)

4 SUPPLY & RETURN CASTING (AFTER 0916)

HYDROTHERM:01-00054-001
SKU: HYDROTHERM:01-00054-001
$128.70