MUnchkin boiler Service & Repair – Marin & Sonoma County
If you have a Munchkin boiler in your home, you may already know that this brand is no longer being manufactured. Munchkin boilers, originally made by Heat Transfer Products (HTP), were popular in the early 2000s for their compact design and high efficiency.
While HTP still supports some legacy Munchkin models, the company was later acquired by Ariston Thermo Group, and many parts are now limited in availability. That’s why it’s important to work with a local boiler specialist who knows these systems inside and out.
At Local Plumbing, we’ve been repairing, servicing, and replacing Munchkin boilers for years across Marin County and Sonoma County.
Common Munchkin Boiler Models We Service
- T50 / T80 – Early residential wall-hung condensing boilers.
- 140M / 199M – High-capacity models for larger homes.
- R1 series – Later models with updated control boards.
Common Munchkin Boiler Problems & Error Codes
Many Munchkin boilers we see in San Rafael, Petaluma, Novato, Mill Valley, and Santa Rosa are 15–20 years old and prone to certain recurring issues:
- F09 – Ignition Lockout – Often caused by dirty flame sensors or failed ignition modules.
- F10 – High Limit – Indicates overheating due to scale buildup or poor water flow.
- F13 – Supply Sensor Fault – Failed temperature sensor.
- F14 – Return Sensor Fault – Faulty sensor or wiring issues.
- F15 – Vent Temperature Fault – Exhaust overheating, sometimes due to a clogged heat exchanger.
Because these boilers are older, repairs may require special-order parts or fabrication of replacement components.
Munchkin Boiler Repair in Marin & Sonoma
Local Plumbing can help you:
- Diagnose and repair ignition failures, circulation issues, and sensor faults.
- Source and install compatible replacement parts (when available).
- Extend the life of your Munchkin boiler with professional maintenance.
- Advise when replacement is the most cost-effective option.

Replacing a Munchkin Boiler
If your Munchkin boiler is no longer cost-effective to repair, we can recommend and install a modern high-efficiency replacement, such as:
- Lochinvar condensing boilers.
- NTI high-efficiency systems.
- Navien or Viessmann combi boilers for heat + hot water.
