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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 90421 BLOCK ASSEMBLY

90421 BLOCK ASSEMBLY

HYDROTHERM:90421
SKU: HYDROTHERM:90421
$3,078.90
Picture of 90422 BLOCK ASSEMBLY

90422 BLOCK ASSEMBLY

HYDROTHERM:90422
SKU: HYDROTHERM:90422
$3,646.91
Picture of 90423 BLOCK ASSEMBLY

90423 BLOCK ASSEMBLY

HYDROTHERM:90423
SKU: HYDROTHERM:90423
$4,331.25
Picture of 90510 FLUE COLLECTOR - DRAFT HOOD

90510 FLUE COLLECTOR - DRAFT HOOD

HYDROTHERM:90510
SKU: HYDROTHERM:90510
$288.34
Picture of 90511 FLUE COLLECTOR - DRAFT HOOD

90511 FLUE COLLECTOR - DRAFT HOOD

HYDROTHERM:90511
SKU: HYDROTHERM:90511
$314.33
Picture of 90512 FLUE COLLECTOR - DRAFT HOOD

90512 FLUE COLLECTOR - DRAFT HOOD

HYDROTHERM:90512
SKU: HYDROTHERM:90512
$403.42
Picture of 90513 FLUE COLLECTOR - DRAFT HOOD

90513 FLUE COLLECTOR - DRAFT HOOD

HYDROTHERM:90513
SKU: HYDROTHERM:90513
$481.39
Picture of 90514 FLUE COLLECTOR - DRAFT HOOD

90514 FLUE COLLECTOR - DRAFT HOOD

HYDROTHERM:90514
SKU: HYDROTHERM:90514
$544.50
Picture of 90534 TANKLESS COIL – PB/HE-4 & PB/HE-5 – WATER

90534 TANKLESS COIL – PB/HE-4 & PB/HE-5 – WATER

HYDROTHERM:90534
SKU: HYDROTHERM:90534
$897.19
Picture of 90538 SWING DOOR HINGE

90538 SWING DOOR HINGE

HYDROTHERM:90538
SKU: HYDROTHERM:90538
$108.90