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 04-1345 GROUND ROD

04-1345 GROUND ROD

HYDROTHERM:04-1345
SKU: HYDROTHERM:04-1345
$79.20
Picture of 05-00102-001 GASKET, ELECTRODE

05-00102-001 GASKET, ELECTRODE

HYDROTHERM:05-00102-001
SKU: HYDROTHERM:05-00102-001
$4.95
Picture of 05-00103-001 SIGHT GLASS GASKET

05-00103-001 SIGHT GLASS GASKET

HYDROTHERM:05-00103-001
SKU: HYDROTHERM:05-00103-001
$11.14
Picture of 05-1578 TANKLESS HEATER, WATER (3.5 GPM)

05-1578 TANKLESS HEATER, WATER (3.5 GPM)

HYDROTHERM:05-1578
SKU: HYDROTHERM:05-1578
$693.00
Picture of 05-1579 TANKLESS HEATER, WATER (5.0 GPM)

05-1579 TANKLESS HEATER, WATER (5.0 GPM)

HYDROTHERM:05-1579
SKU: HYDROTHERM:05-1579
$721.46
Picture of 05-1580 TANKLESS HEATER (3.5 GPM)

05-1580 TANKLESS HEATER (3.5 GPM)

HYDROTHERM:05-1580
SKU: HYDROTHERM:05-1580
$408.38
Picture of 06-00013-001 GASKET, FILTER BOX COVER

06-00013-001 GASKET, FILTER BOX COVER

HYDROTHERM:06-00013-001
SKU: HYDROTHERM:06-00013-001
$28.46
Picture of 06-00020 BLOWER TO SWIRLPLATE GASKET

06-00020 BLOWER TO SWIRLPLATE GASKET

HYDROTHERM:06-00020
SKU: HYDROTHERM:06-00020
$6.19
Picture of 1 1/4 X 3 NIPPLE

1 1/4 X 3 NIPPLE

HYDROTHERM:53-1250
SKU: HYDROTHERM:53-1250
$12.38
Picture of 1 1/4 X 3/4 X 1 1/4 TEE

1 1/4 X 3/4 X 1 1/4 TEE

HYDROTHERM:56-1603
SKU: HYDROTHERM:56-1603
$45.79