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 21-25 of 70 reviews

"Home radiant heat system"

1.0 rating
Very Unsatisfied

I also agree with those that say this unit is very expensive to maintain. With all the cost I pay every year I could buy a new boiler. Every year there is new issue. Munchkin did a great job of selling small but a bad job of providing reliability. Don't buy a munchkin.


Huxley, ia

"My 2 are good after 8 and 6 years"

5.0 rating
Very Satisfied

Have had no probs with mine. One at each house I own in Richmond va.

J Roberts

richmond, va

"11 years no problems- until now"

5.0 rating
Very Satisfied

Not a problem for 11 years. Now we are getting f09 codes. We have cleaned both probes and works for a while. Now I see there is water in the cabinet and on the floor around the munchkin– any ideas where the water would be coming from? Should I be concerned or can it wait until this miserable winter is over?



"My Munchkin rocks"

5.0 rating
Very Satisfied

My 140m (natural gas) has been running flawlessly for seven years. Space heating and domestic hot water. I've cleaned it twice. I maintain commercial HVAC systems for a living… wish they ran as well. Now maybe I just got a good one. I'm reading all the gripes but my experience has been great. I'm not an installer, but I did install the Munchkin myself. I followed HTP's instructions. (Yes, I should analyze the combustion gas one day)

Larry P


"Internal Leak Warranty Worthless"

1.0 rating
Very Unsatisfied

I installed a Munchkin 140 mlp in October of 2006 after being told it was an excellent choice. The cost of the boiler and installation was $3846. Now it has developed an internal leak. Munchkin states it has a prorated 12yr leak warranty. Being in it's 8th year, I was told it was 75% covered by warranty. By the time the tacked on installation, shipping and processing fees plus a huge increase in the cost of the boiler, replacing it under warranty would cost me $4700. This warranty is worthless!

D Donarski

Minong, WI

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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