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HydroTherm Boilers

Updated: Mar 15, 2016
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Hydrotherm is a discontinued brand of residential and commercial boilers. Hydrotherm was a Mestek Inc. company. Mestek had net sales of $3.45 billion in 2014.

Corporate History

HydroTherm was a division of Massachusetts-based Mestek Inc. Mestek, dating back to the 1853 creation of the Mills Boiler, today is made up of 38 companies across several industries. Mestek acquired Northvale, N.J.-based HydroTherm’s assets in 1991. Hydrotherm was listed by its parent company under the brand name of its popular boiler, KN-Series, but the KN-Series is now produced under the Advanced Thermal Hydronics company name.

Product Lines

Hydrotherm’s residential boilers included gas-fired water and steam units as well as an oil-fired series.

The HWX gas-fired water boiler, available in five sizes, reportedly rarely required maintenance, which was attributed to its simple design. HVX gas-fired water boilers came in four sizes designed for flexible installation. The HVX features an induced draft blower that easily vented flue gases up the chimney or through an outside wall. VGX gas-fired steam boilers came in seven sizes designed for dependability. Each reached up to 82 percent AFUE.

The brushed stainless steel Sabre PB Series oil-fired boilers, both steam and water, were designed for their whisper-quiet operation and to be easily serviced by maintenance technicians.



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260 North Elm Street
Westfield, MA 01085

Phone: (413) 564-5515


HWX, HVX and PB Series boilers carried a limited lifetime warranty, while the VGX was covered for 10 years.

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