HTP Munchkin R1 Boilers | "Revision 1" Boiler | FurnaceCompare®

HTP Munchkin R1 Boiler Overview

Manufactured by Heat Transfer Products Inc. (HTP), the Munchkin R1 is a residential ultra-efficiency boiler offering up to 95.1 percent AFUE. This Energy Star-certified series has five models ranging in heating capacities from 50,000 to 199,000 BTUs.

Available as a wall- or floor-mounted unit, the R1 has a lightweight design geared toward providing easy installation, as well as zero clearance to combustibles. The R1 also offers four different venting options–vertical, unbalanced, sidewall and concentric–for flexible installation and airflow.

Indirect water heater integration, a durable 316L stainless steel heat exchanger and an outdoor reset that detects temperature changes outside and adjusts the interior temperature accordingly are additional features of this unit.

The Munchkin R1 series is a revised version of the HTP Munchkin boiler series.

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Consumer Reviews of HTP Munchkin R1


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #3 of 12 HTP Boiler
  • 30% of customers recommended

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HTP Munchkin R1 Boiler Reviews

Showing 1-5 of 70 reviews

"Unreliable Boiler"

1.0 rating
Very Unsatisfied

Best thing I did and was replace this piece of garbage.

James Doyle


"Very well maintained"

1.0 rating
Very Unsatisfied

There is no mistake (other than making this purchase!) I have ever made while maintaining this boiler annually (as in every year) completely by the manual! But this boiler, in my opinion, has been plagued with problems! There was not any customer support displayed by HTP and no responsibility for using sub-par parts and the assembly of their products. I can't believe that they are still in business with the absolute junk they halfway engineer, then rush out onto the market. I do like the boiler when it's working correctly, but I feel that I cannot leave home without worrying that it will break down while I am gone.


North Michigan

"Poor if that good!"

1.0 rating
Very Unsatisfied

I got this boiler to replace a munchkin boiler that I had two of. This htp is a new boiler that the installer said was a good boiler. I got this replacement boiler Jan.31 2017 so I have used it for about maybe four months. Now it will not run because they say the control board is bad. This is a new boiler they are saying it still under the old boilers warranty because it was a replacement. That is like saying if you buy a new car it comes under the warranty of the car you traded in. I travel a lot and need a reliable one.

Thomas Soderberg


"Don't Buy"

1.0 rating
Very Unsatisfied

These boilers last two years before the heat exchanger warps and fails. Flue temperature will increase over time and boiler will continue to trip out on overheat. I have had two of these boilers. The first started failing at 18 months and it took 6 months and a threatened law suit to get it replaced under the three year warranty. The second had the same issues and the company is now saying there is only a 1 year warranty. Any talk of a class action law suit?? Boilers should be a worry free purchase but HTP's lack of customer support and inferior product make this boiler a nightmare to own. Noble Trade,the company that supplied the boiler does not stock this product now and is not supporting the HTP product line. They won't even contact htp on my behalf for compensation so I am left holding the baby. Buyer beware!!!

Frank Murphy

Ontario, Canada

"Good boiler, but no repair(wo)men around"

1.0 rating
Very Unsatisfied

I am having a seriously difficult time finding someone who has worked on HTP boilers before; I've called my voice off. Is there any service/repair manual available to help someone when he/she comes to clean this thing? HTP has nothing, but I am hoping a "Chilton" is around somewhere. Please advise. Thanks. John. PS: I have a Versa Hydro Solar, not a 199m, but the list does not have my model so I picked one at random above.

J Klingel

Fairbanks, AK

Other Munchkin R1 (Revision 1) Reviews

Most of the reviews around the web pertaining to the Munchkin R1 revolve around troubleshooting issues. Web forums such as and reflect a wide array of complications homeowners have had with this unit. Ignition failure, water discharge, blower motor replacement and failing components are among the issues posted.

In addition, contractors on note that Munchkin units have had problems in the past with specific components, such as inducers and swirl plates. In order to prevent unexpected repairs or component failure, these contractors advise consumers to ensure their units receive yearly maintenance.

HTP Munchkin R1 (Revision 1) Model Numbers

The Munchkin R1 (Revision 1) is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
140M 92 140000
199M 92 199000
80M 92 80000

Munchkin R1 (Revision 1) Warranty

HTP provides a 3-year warranty for the R1 blower motor and a complete 1-year warranty for any defective parts. Within two to seven years after installation, HTP will replace or repair any part that is defective due to a leaking heat exchanger.

During the eighth through twelfth year of use, HTP will cover only a certain percentage of the cost to repair or replace the defective boiler. The percentage paid varies depending on the age of the unit.

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