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 16-20 of 70 reviews

"Junk, junk, junk"

1.0 rating
Very Unsatisfied

Their highly reliable field starter is shit. Unless you don't mind replacing it every six months for a nickel a piece. Lousy, lousy design. And they know it.


Idaho Falls, ID

"A little picky"

4.0 rating
Somewhat Satisfied

I've had a Munchkin T-140M for ten northern Michigan winters, and generally it has done me well. I finally replaced the blower motor this year. It was installed with concentric venting and there is a bit of reversion evidence inside the boiler, but I have since put an extension on the exhaust vent to hopefully minimize this. I have had the hx and burner cleaned and inspected most years. It rumbled a bit last year, and I finally traced the noise back to a shredded swirl plate which was replaced along with the burner gasket. There's no more rumble. Today, though, the display began reading "nc", which I've read is due to voltage problems. It still heats and runs, but the readout won't display anything. How long will it run in this condition, and should I order a new control board? Why would a voltage problem develop randomly on a given day? Homer? Steven? You guys out there?

P. Conway

Ellsworth, MI

"This is one Company and Boiler to Stay Clear of."

1.0 rating
Very Unsatisfied

I have had two Munchkin Boilers installed in my new home over a 5 year period. The first boiler sprang a leak and had to be replaced -at my cost – of more than $2200. Within a two year period, the second Munchkin began leaking around the water jacket, and had to be replaced. At this time I upgraded to another Boiler, at the cost of $3000. I appealed to the htp company, seeking replacement costs and labor costs for the shoddy piece of equipment they sold me. I got a reply, saying they do not pay for labor and installation. The installer no longer carries this brand, due to the lack of support and questionable equipment this company offers. I would strongly advise everyone to seek out another company for your piece of mind, and for your wallet's sake.

Jerry A. Rice

Hudson Valley, NY


1.0 rating
Very Unsatisfied

I bought a home that has one installed and i'm pulling my hair out. The wife gives me shit for no hot water I phone the people who installed it and give them shit I hope they are phoning the people who built the thing and giving them shit. Nothing is worse than arguing with the wife on why I haven't replaced the thing and my answer to her is I'm sure they can fix it. I'm having my reservation now if that can be done after some three years of this crap in our house. Now I have the $10,000 dollar question what to replace it with.

Doug Mitchell

Medicine Hat

"A Piece of Junk"

1.0 rating
Very Unsatisfied

I replaced a 50 year old American Standard furnace that always worked with this unit. It was the biggest mistake I ever made. We installed this unit in August 2005. We have had major repair bills since the second year. The repair bills have been anywhere from $575 to $1,000. The swirl plate was eaten up several times. The last straw was this winter, when after a $1000 repair the unit went out while we were away. We returned to frozen pipes and about $50,000 worth of damage. We had a representative from Munchkin out during the second year and he was worthless and felt they were not responsible for this piece of garbage. Now I have to bite the bullet and replace it after 8 1/2 years.

J. Reisman

Cambridge, Ma

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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