HS Tarm Wood Furnaces

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HS Tarm Wood Furnace Overview

HS Tarm is a manufacturer of wood and biomass boilers for private residences. The company is privately held and headquartered in Denmark.

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Consumer Reviews of HS Tarm


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #12 of 37 Wood Furnaces
  • 37.5% of customers recommended

Corporate History

HS Tarm Company was founded in the early 1900’s by Rasmus Sorensen. His son Han expanded the company to include wood stoves and central boilers, manufacturing his first boiler in 1927. It was his initials (H.S.) that were eventually incorporated into the company’s name and logo.

The company was sold to the British BAXI Group in 1993 and changed its name in 1999 to BAXI A/S. In 2009 the BAXI Group merged with DeDietrich Remeha and was renamed BDR Thermea. In 2010 the company was sold to Martin Sorenson, the grandson of the founder of HS Tarm.

For many years HS Tarm products were distributed in the United States by New Hampshire-based Tarm Biomass, but in 2016 the company began phasing out as the company’s distributor.

Product Lines

HS Tarm wood and biomass heating products include the Solo-Innova, Bonus Light, TK, and DBK. The Solo-Innova is a top-of-the-line unit available in 30kW and 50kW models, and a 150ltr log chamber is standard.

The Bonus Light is a 30kW unit with a 90ltr long chamber. The TK is available in 30kW and 45kW models with a 150ltr combustion chamber and an induced gas fan.

The DBK gives you the option of a 30kW log boiler or a 22kW pellet boiler and features automatic change over between log firing and pellet firing.


HS Tarm boilers are covered by a 20-year limited warranty.

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HS Tarm Wood Furnace Reviews

Showing 1-5 of 8 reviews

"Tarm Sprung a leak"

1.0 rating
Very Unsatisfied

Anyone else has a Team and the boiler erodes to where it creates a hole in the jacket drain UK NGOs all the water? This is the 4th team I know has done this. The other 3 within 8 years.

Jeff Whitten



2.0 rating
Somewhat Unsatisfied

Find ways to get put of warranty equipment. Calabration off on aquastats which cause unit to run hotter. This lead to load door to warp. Happened in year two of burning. Would not warranty the door, did not even offer a discount for new one. Aquastat is 20 degree of on calibration, had to keep adjusting till we got it running at proper temps.

Joseph Alcott


"Hate my Tarm"

1.0 rating
Very Unsatisfied

Worse product I ever bought, do not buy a Tarm, I live in New Jersey, no one to service unit. Trouble since the day I bought it. Company sells you parts that you have to install with no guarantee that is the problem, you are totally on your own. Expensive piece of garbage


"Solo Plus 40"

1.0 rating
Very Unsatisfied

I am in my 11th heating season with my tarm Solo Plus 40 and it is an incredibly efficient unit. For maximum efficiency you must have "turbulators" or restricters in the heat exchange tubes. Using those, and a heat storage tank, my unit is well over 90% efficient. As for cleaning, I brush out the heat exchange tubes 2 or 3 times per season. I heat a 3500 sq ft house, 3 stall garage and my domestic hot water on 7 to 8 cords per season. (Michigan) As for maintenance, I replaced the rope gaskets in the doors once and the lower refractory unit twice for a total cost of less than $300 in 11 years while saving thousands of dollars on propane in that time. It takes a little finesse to operate and maintain but is well other the effort. I highly recommend any tarm product.

J. Lobbezoo

Alto, MI

"no maintenance?"

3.0 rating

As far as warming this 3300 square foot house it has been very satisfactory, using about 6 cords of wood a year or more. On the other hand it constantly needs cleaning, every two weeks through the heating season, a dirty unpleasant job. Now I'm told I need to replace all the refractory brick after only 5 heating seasons, $1.200. A chessy set of fiberglass gaskets costs $50! Very disappointing. I wouldn't believe these other reviews if they are of the Solo 40.

anthony siciliano

redding ct

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