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.
After 12 years, first failure last night. Low pressure switch failed. Jumpered it and boiler fired. New pressure switch on the way for $26.
So this boiler is costing me $2 per year to run. ( not counting my time)
An over-engineered piece of junk. Don't ever buy one. They need lots of maintenance thought! The one's, a honeywell furnace, we took out were there for 30 years without issue. It stops working displaying faulty codes. Technicians disassemble the furnace, couldn‚Äôt find things wrong and put things back and starts the furnace. This happens in monthly bases. I can't even being to describe the nightmare it's been and the money we have lost. Boilers should last for many years certainly not just 4 or 5. Also a company should stand by its product and if it gets discontinued they should replace it. I'm furious does anyone know what to do? If you do not want to rebuilt the entire boiler over every 4- 6 years, then stay away.
Had this installed in 2003 to heat 5000 sf including domestic water. It had a few issues that I was able to figure out (new board, fan, electrode a few times). My brother has a smaller house and uses 2 regular Water heaters and 2 he furnaces. He keeps parts of the house unheated and still pays more than me in my toasty house (live in the same town). When properly installed and maintained, the Munchkin is hard to beat.
"Lived 11 years"
Paid top dollar to learn it broke all the time because it was "sensitive" !? Constant breakdowns, three gas valves, backfiring so loud would shake the whole house and scare neighbors. Spent 260$ to find out was dead as the last laugh. Bought a Bosch Greenstar, put it in today. Combi unit so no indirect water heater anymore either
Citizen of New York state
"Quite Happy with Mine"
My Munchkin 80m was installed in 2002 and has pretty much worked extremely well ever since. In about 2014 the blower was replaced, but other than that I have had no problems. I get a maintenance visit for cleaning about every 3-5 years. I would definitely consider buying another HTP product based on my experience with this Munchkin.
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.