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 11-15 of 70 reviews


1.0 rating
Very Unsatisfied

I had a pro install a new high end Munchkin in our 4 unit rental in 2006. It's been a nightmare ever since. Many nights I've had to put tenants up in a motel because there was no heat or hot water. So far this winter there have been almost a dozen service trips and it's not even 12/21 yet! Now metal filings are clogging the relief valves. Time to get rid of this pos. I pulled out the old paperwork and was happy to see the warranty, "up to 12 years to insure customer satisfaction". BS, it only covers a leaky heat exchanger. Nothing else. Over the years we've replaced numerous circulator motors, the main controller, and numerous other parts. Whatever we do, it never lasts more than 2 weeks before shutting down. Stay away!

W Sarokin

Hudson Valley, NY

"Hot water ready! Fits in the closet!"

5.0 rating
Very Satisfied

Our Munchkin T80M was already installed when we purchased our condo. It is installed in our small 5×7 utility closet and it still leaves plenty of room for a small set of shelves to keep our vacuum, tools, etc. When we turn on the hot water in the kitchen or the bathroom, it comes out after waiting about 3 seconds, which is pretty darn quick from my experience. We have not adjusted the temperature, but if we wanted it hotter, it is possible. I have no complaints thus far about our Munchkin, it is perfect for our condo. If it ever needs replacing, I would definitely be looking for the same unit.

Westbrook, Maine


1.0 rating
Very Unsatisfied

Has anyone filed a class action lawsuit against this company? If not, let's all get together asap.

joe cassidy

San Francisco, CA

"A great efficient source of heat for the entire house."

4.0 rating
Somewhat Satisfied

I couldn't be more happy with my boiler system; radiant heat is superb. I converted all heat demand to be supplied by a boiler. The recovery time on the hot water is quick, less than an hour even after everyone in the house showers. The warm floor on your toes on a winter's morning is a nice perk. It takes quite awhile for the radiant heat to transfer to the air, so I have a standby electric heating element in the A/C unit just in case. The flame sensing unit tends to soot up every other year; the boiler does not see the flame, and it shuts itself down. Kind of annoying, but easy to replace.

Cedar Rapids, IA

"Munchkin boiler is awful"

1.0 rating
Very Unsatisfied

We had a Munchkin boiler installed in our home in late 2007 at a cost of $10,000 (boiler and labor). Less than 7 1/2 years later (after spending considerable amount of money to have it periodically repaired when it stopped working) it completely died and we had to have a new boiler installed – now at a cost of $12,000. The Munchkin Warranty document begins "Twelve year warranty to assure your complete satisfaction." However, when one reads the fine print, it appears that there is no basis to make a claim under this warranty. We feel that the product was a rip-off and we're not optimistic that Heat Transfer Products will do anything to compensate us for the loss.

D. Benjamin

Belmont, 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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