HTP Munchkin Boiler
Updated: Oct 17, 2018Write a review
Read more about HTP Boilers
Overview of the Munchkin
The Heat Transfer Products Munchkin is a discontinued fully modulating gas boiler with an efficiency of 90% AFUE. It featured a stainless steel heat exchanger for optimal heat transfer and resistance to corrosion, and its compact, lightweight design provided greater installation flexibility. An Inconel NIT burner and spark ignition assured reliable operation, while a self-diagnostic microprocessor control monitored the system and made servicing easier.
Later versions of the Munchkin boiler include the Munchkin R1 (Revision 1), featuring a digital display and upgraded burners, and the Munchkin R2 (Revision 2), which differed from previous units because of its wiring and metal latches.
Date created: 2018-10-17
Name: Mike A.
Location: Upstate New York
"HTP owes me some money"
I purchased a Munchkin boiler from a respected contractor in 2007. Last year I started having problems with it. Imagine my surprise when I was told that it’s time to replace my 11 year old boiler! Apparently, there have been “problems with it.” I was told “that heat exchanger could go anytime.” Who sells a boiler that has such a short life span? HTP, your response and warranty is a joke. As far as I’m concerned, you have stolen from me.
Date created: 2018-01-07
Location: Greater Boston
"Great boiler, installation and service is key"
My 9 year old Burnham cast iron boiler failed in late 2008. The cast iron boiler cracked. My plumber recommended the Munchkin. Minor problem at first. The day the building code inspector showed up, the unit sprang a leak. Lucky break. I got the Obama 2009 tax credit as result. A few parts needed to be replaced once in the boiler on the annual service and the outdoor thermometer had to be replaced 2 years ago. Savings the first year were in the 30 to 40% range despite lower per therm gas costs. Given the other posts I have read, nobody makes cast iron boilers that last for ever these days, at least consumer models. Mod con boilers are complex and trained installation and service is key. The single shingle plumber can't do it. It is sort of like taking a modern fuel injected car to an old school mechanic that is lost when he can't find a carburator to tune.
Date created: 2018-01-03
Name: J. Smith
Location: Milwaukee, WI
We put in two Munchkin boilers - 3-4 years ago. They are nice and small, and seem to be efficient. They need lots of maintenance thought! The one's we took out were there for 30 years without issue. Every year since, we have spent at lest $500 fixing the two boilers. Issues: leak in hot water heater (circuit from boiler) - new water heater; new boards; didn't drain and corroded burner,box, and ceramic tiles, new thermocouple, new circuit motor. Service company wants to charge $5-600 annually to inspect & clean. What a rip off. These units require lots of maintenance. Stay away. Terrible.
Date created: 2017-11-10
Name: R Cecchi
Location: Olean, NY
"Worst boiler ever"
Our boiler was fine until about 6 months after the warranty expired then nothing but trouble. You spend a lot of money for a high efficiency boiler you expect it to last more than 7 years! Now it is tough to even get parts and my tech said he has replaced 4 this year. Sad waste of money
Date created: 2016-12-26
Name: A Kleck
Location: Ebenezer, SK
"Starts with rumble"
I have a 4 year old MC-120 boiler that makes a rumble (sounds like a base subwhoofer) when starting up. I believe it rumbles between 1st and 2nd phase of start up. Plumber just changed spark electrode and flame rectification probe but the rumble continues. Any help as to what might be causing this rumble would be greatly appreciated.
Date created: 2016-12-21
Name: Rachel Hallas
"I'm thinking of suing"
We have had nothing but trouble with this product. We had this installed and inspected by the city. I can't even being to describe the nightmare it's been and the money we have lost. Boilers should last for many years certainly not just 4 or 5. Also a company should stand by its product and if it gets discontinued they should replace it. I'm furious does anyone know what to do?
Date created: 2016-10-07
Name: M. Godsey
Location: Hood River, OR
Constant failures are the premier feature of Munchkin boilers. The first time my boiler failed the technician cut a piece of wood to tilt the boiler at a slight angle, explaining that the design did not have a slope to allow condensate water to drain. Then it turned out that the shim was not thick enough so condensate water built up and reached the fiber ceramic target disk which disintegrated into a toxic pile of fiber. Of course this was just the first year of failures. Currently I get F10 errors several times a day and the furnace stops working. Technicians have replaced every part recommended by Munchkin. Finally they told me that technicians call this boiler the "road of tears" since 90% of these boilers fail in 3-5 years. Mine was unusual since it lasted 8 years... 8 years of constant failure.
Date created: 2016-04-20
Name: Mary Alexander
Location: Marblehead, MA
New home build 10 years ago. Installed "state of the art" Munchkin. Have basically rebuilt the entire boiler over the last 8 years. Stay away.
Date created: 2015-02-26
Name: D. Jones
Location: Cleveland, OH
"My Munchkin is fine!"
I have read many of your problematic complaints on this unit. It is far from crap or junk. Now I tend to overbuild when I install something. If you took shortcuts in plumbing, or the power feed, or water replenish, or the air breather - just to name a few - you basically jinxed yourself. Mine has been running as planned for over 6 years, and has kept our 2300 square feet toasty even during this miserable February. Let me guess - none of you did any preventative maintenance - like a fluid changeover each year? Wonder how your car does?
Date created: 2012-12-31
Name: L. Overland
"NEVER Purchase Anything Made by Munchkin!"
Do yourself a big favor and never buy one of these. It may work for a year or two, but then things start to go downhill - fast! In the last six months I've spent about $1600 trying to fix this train wreck of a boiler. So far, nothing has worked. It still errors out quite frequently. This is especially distressing when out of town during cold months. It's essential that a friend come by every couple of days to make sure it's working. I was recently out of town for 9 days. It failed twice during that time and had to be reset. And this is not just a fluke. Our entire group of condos is rife with these types of problems. One of our neighbors had to essentially rebuild his entire home because it failed; the pipes froze, and then leaked profusely when things warmed up. He came home to a ceiling collapsed on his dining room table and entire walls, upstairs and down, irreparably water damaged. This boiler is no good!
Date created: 2012-12-09
Name: J. Shanley
Location: Newburyport, MA
We have replaced the blower and the electronics on our unit. Now it looks like we will need to spend even more to fix the latest issue. Pretty soon, we will have spent as much on keeping it running as we did to purchase it. When I called Munchkin, I was told "you can have efficiency or reliability". Wonderful. All the money we save on efficiency we get to spend on replacement parts. Crummy product, crummy company.
Date created: 2012-01-05
Name: K. Reis
Location: York, PA
Years owned: 4
We have had nothing but problems with the Munchkin furnace...we converted from steam heat to hot water and our plumber highly recommended this system....we are never sure how long it's going to run before we have to try to fix and reset the damn thing...F9, F10, and f11 problems. If we hadn't watched and learned what to do, the repair costs would have put us in the poor house. As it is, we may end up buying a new furnace. If it says Munchkin on it....RUN!!!!!
Date created: 2011-11-30
Location: Southern MN
Years owned: 7
"Nothing but trouble"
This stupid unit was installed in 2004 and has needed multiple repairs every year. What a hunk of junk! How did this thing ever make it onto the market? After the first 2 or 3 years we got sick of having it fixed all the time, so we insisted on a whole new Munchkin unit, and that one has been just as bad as the first. Every Fall, when it's time to get the heat going, we have to go through the routine of realizing that it isn't working right (again), calling the service guy, having to wait some days for parts while our house is chilly, then have it repaired, which may not work, bringing us back to square one, or it may last a while. If we're really lucky, it'll work for the rest of winter, but guaranteed, it's going to break down again too soon. We've had to have it fix at least once a year since we've gotten it. I'd never buy anything made by this company again.
Date created: 2011-09-07
Name: Stephan Wilkinson
Years owned: 3
"Seems OK if you know what you're doing..."
Okay, it's true, this furnace does kick off maybe every six months and needs resetting. I had it happen once because of a tiny loose nut that got into the impeller area and broke up the swirl plate. I replaced the swirl plate myself (I'm a freelance writer, not a plumber), and the unit appears quite simple, when I got it apart. Another error code a year later, "exceeded high limit." Pushed the reset button and it worked fine. Another error code soon after that, "NC," which is unlisted in the installation-and-maintenance manual but I assume means "No Code." Reset did nothing, so I cycled the circuit breaker and it fired right back up. Bottom line is that if all you know how to do is work a telephone to call a service person, this furnace is not for you. (Doesn't really matter, since I see they're out of production.) If you have a basic grasp of machinery and electricity, you can deal with it. Frankly, I don't have much respect for people who can't replace a clothes-dryer drive belt or change their car's oil. Or deal with a properly installed Munchkin. You need to download the manual and do the annual maintenance (which takes maybe 20 minutes and a few tools).
Date created: 2011-02-25
Name: E Smithe
Location: Carlinville, IL
This furnace cost $5000 to install and in the three years since has had to have twelve service calls and two factory tech rebuilds which have ended up adding another $2000 to the cost of ownership! Do not buy this thing no matter what anyone tells you. You will regret it. We're in the middle of a midwestern snowstorm here, it's midnight, and our furnace has stopped working again - kicking up an error code that can not be fixed without another service call. Temps are dropping as I type this on my cell phone and it looks very likely that by morning, if I make it until then, most of the pipes will be frozen through. Munchkin should be ashamed of themselves for making such a terrible product!
Date created: 2011-02-22
Name: T. R.
"Nothing but problems!"
This furnace has repeatedly shut down for five years. The service personnel have virtually rebuilt the entire unit. The last time it shut down, it caused the freezing of pipes and bursting of radiators resulting in more than $15,000 of damage!!! Do not buy a Munchkin.
Date created: 2011-01-27
Name: Saggy Pants Plumber
"Junk, Plain and simple"
I work for an hvac company in Iowa. These things cause me constant headache. Even if they are "Properly installed" they will still break down. I have replace every component of this system, Swirl plate, combustion blower, board, heat exchanger, you name it. In total this year we have torn out 11 Munchkins and replaced with the Prestige Triangle Tube. And to be god honest, we have had a few Prestige's in for a few years and just recently had a call on it for other than low water pressure (plugged reducing valve)
Date created: 2010-02-16
Name: D. Wessely
Location: Milwaukee, WI
Years owned: 5
"Sophisticated Simple System"
I am a Project Manager with a Senior Housing Company. We have 5 (yes five) Munchkin boilers in two of our buildings North of Milwaukee, wi. The reviews I've read all seem to say the same thing! You must hire a trained hvac contract for the install. Our contractor was from the Madison area; only one who answered key questions properly. The other most important issue is "owners" must follow scheduled maintenance on complete system to keep boilers functioning at their optimum.
Date created: 2010-02-01
Name: Todd Weber
"Don't like them as an installer"
I am a "solo plumber". I have been installing high efficiency boilers for about 10 years and have had to do repairs on about 5 of them in that whole time. I agree with all of you that Munchkin is a terrible product, but you must also pick your installer of any high efficiency product very carefully. Also remember the size of the company does not matter. I am a one person company and the manufacturers call me from time to time to go repair their units. And if anyone wants my input, I swear by Triangle Tubes products with a 10 year parts and labor warranty for certified installers and a lifetime warranty on indirect water heaters. I hope my opinion is of assistance to people.
Date created: 2010-01-25
Name: C Timmins
Years owned: 4
"Munchkin Boiler # 199M ?"
Munchkin was praised highly by the heating contractor when we were switching over from oil heat to natural gas. What a big mistake! If the dealer loved the Munchkin, I can see why: He's working on it constantly. We, Munchkin owners are supporting the heating/plumbing services. No, they love Munchkin. Never again will we buy Munchkin. We have had error codes upon error codes, flame, panel, and now after less than four years, the cheap plastic fan blade is split and broken. Eleven hundred dollars later, we still have that piece of excrement in the basement, like a ticking time bomb, scheduled to misfire and self-destruct at regular intervals. Piece of crap!
Date created: 2009-06-16
Name: Munchkin owner
Years owned: 1
"Combusion air problems"
Munchkin boilers are well made and efficient, however, they’re very susceptible to contamination in the combustion air source. We live in a relatively dusty area and require service more frequently than you would expect. We replaced an old inefficient boiler expecting our cost to decrease significantly. What really happened is that we simply transferred the flow of money from the utility company to the boiler service company. Total cost of ownership must include the cost of servicing the boiler not just installation and utility expenses.
Date created: 2008-12-25
Name: Ron Zalewski
Location: Deerbrook, WI
Years owned: 7
"Munchkin Boiler-80 M"
This boiler was installed in our new home in the fall of 2001 during construction. Since then the boiler has failed four times, costing us over $1500 in "maintenance" as well as the inconvenience of being without heat for several days when the temperature was below zero. Two pressure switches have failed, and two blower motors. Talk about fearing traveling in winter for any extended period of time, I just can't do it without wondering whether I will return home to frozen pipes or a flooded mess! Munchkin service representatives did help my contractor a couple of times but obviously this unit has been a lemon that has let me holding the bag!
Date created: 2008-08-18
Location: Durango, CO
Years owned: 4
"Munchkin boiler is a nightmare!"
I can't even begin to tell you all the problems we have had with this thing. Almost since the moment the Munchkin was installed we have had problems. The first time it stopped working was on Thanksgiving Day 2004. Since then we have had it break at least a dozen times. We have even had a whole new Muchkin put in and still have problems. We live in Colorado and on several occasions (in the dead of winter - January) we have gone without heat or hot water. Unless you want endless headaches and cold winters I would recommend spending your money on any system other than the Munchkin.
Date created: 2008-03-29
Years owned: 4
I have a small 80mbh Munchkin boiler heating a 4000 sq ft shop! The most efficient, quietest unit on the market. I have installed over 20-30 of these boilers, I have had an occasional problem, they were are installer problems! I guarantee you most of the complaints that people put on these websites, are due to them choosing an unqualified contractor! Word of advice, quit worrying about the brand, Investigate the contractor, quit buying from the cheapest guy!!!!!!!!!!
Other Munchkin Reviews
Many of the comments regarding problems with the Munchkin have to do with them not firing properly. A professional on hvac-talk.com said that he'd done many service calls on the units and almost all of the problems were due to the gas/air mix not being set right.
What does a Munchin fault code F-02 mean?
According to page 63 of the Munchkin Gas Fired Boiler manual:
Fault Code F03 description: "Interrupted or Shorted Return (Inlet) Thermister."
To fix/remedy the problem:
- Check the electrical connection to the thermister on the outlet manifold. Verify 5 VDC by checking in Molex connector. Verify thermister values by referencing chart in this manual.
- Replace thermister if necessary.
The warranty for the Heat Transfer Products Munchkin boiler is comprised of the following:
- Complete 1-year warranty on defective parts
- Limited 3-year blower motor warranty
- 12-year heat exchanger warranty, pro-rated after the 7th year