With thousands of Munchkins now in service, we can confidently say
Munchkin is the most reliable and popular high-efficiency boiler in
America. Munchkin has set the standard for hydronic systems efficiency with
load matching modulation, while providing whisper quiet operation
from a tiny corrosion-proof box.
- 92% AFUE, 97% combustion efficiency
- Fully modulating for ultra high efficiency
- All stainless steel construction
- Compact, lightweight design
- Direct vent with standard schedule 40 PVC
plastic pipe
- Super quiet operation
- State-of-the-art control

- Reliable field-proven spark ignition
- Sealed combustion
- Environmentally friendly
- Modular component construction
- 12 year limited warranty
- Operates at low supply temperature
M O D E L S
- 399M:
400K/80K BTU Input NEW!
- 199M:
200K BTUs
- 140M:
140K BTUs
- 80M:
80K BTUs
- 50M:
50K/10K BTU Input Wall Mount NEW!
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Munchkin Sections:
· Munchkin Features
· Munchkin Operation
· Heat Exchanger Info
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