Boiler Installation & Repair

Boilers heat differently than furnaces — and they need a technician who actually understands them to install and repair them correctly.

Boilers are one of the most common heating systems in older New England homes, and central Massachusetts has no shortage of them. Radiators, baseboard units, and radiant floor systems all depend on a boiler that is running properly to deliver consistent heat through the winter. When something goes wrong — whether it is a pressure issue, a failed circulator pump, or a boiler that simply will not fire — the effect on your home is immediate. At Shelly Heating and Cooling, we work on boilers regularly and know what it takes to diagnose and repair them correctly. This is not equipment we figure out as we go.

We install new boiler systems and repair existing ones across Winchendon, Gardner, Athol, Fitchburg, Leominster, Templeton, and throughout Worcester County and Franklin County. We service gas, oil, and propane boilers — which covers most of what you will find in homes across this region. Whether your boiler is losing pressure, producing uneven heat, making unusual noises, or has stopped firing entirely, we work through the system methodically to find the actual cause. Older boiler systems in particular require someone who knows the equipment and does not just default to recommending a full replacement when a targeted repair will solve the problem.

When a boiler genuinely needs to be replaced, we handle that too — from selecting the right size and fuel type for your home to completing the full installation and making sure every zone is heating the way it should. Call Shelly Heating and Cooling at (978) 868-3403 and we will give you an honest assessment of where your system stands and what the best path forward looks like. We are available 24 hours a day for boiler emergencies across the entire service area.

What We Offer:

New Boiler Installation — We install new gas, oil, and propane boiler systems in homes across central Massachusetts, sizing the equipment correctly for your heating zones and the layout of your home.
Boiler Replacement — When an aging boiler is no longer worth repairing, we remove the old unit and install a modern replacement that heats more efficiently and reliably through the full heating season.
Boiler Repair — All Fuel Types — We diagnose and repair gas, oil, and propane boilers across all major brands, including pressure problems, ignition failures, circulator pump issues, and zone valve faults.
Circulator Pump Service & Replacement — A failed circulator pump means hot water stops moving through your heating system. We replace circulator pumps quickly to restore heat to affected zones.
Pressure Relief Valve & Expansion Tank Service — Boiler pressure issues are both a comfort and a safety concern. We inspect, test, and replace pressure relief valves and expansion tanks to keep your system operating safely.
Zone Valve Repair & Replacement — Multi-zone boiler systems rely on zone valves to direct heat where it is needed. When a valve fails, one or more areas of your home stop heating. We repair and replace zone valves across all common system configurations.
Burner Cleaning & Annual Service — Regular boiler service keeps the system running efficiently, reduces the risk of breakdowns, and extends the life of the equipment. We clean burners, inspect heat exchangers, and test all safety controls as part of a complete service visit.

Why Choose Shelly Heating and Cooling for Boiler Installation & Repair

Real Boiler Experience — Boilers require a different set of skills than furnaces and air conditioners. We work on them regularly across Winchendon and the surrounding towns and know the common failure points, the quirks of older systems, and how to repair them without unnecessary replacement.

All Fuel Types Serviced — Gas, oil, and propane boilers are all part of what we service. Homes throughout rural Worcester County and Franklin County rely on oil and propane heat, and we have the experience to work on those systems competently and safely.

24/7 Emergency Boiler Repair — A boiler that stops working in January cannot wait until the next available appointment slot. We are available around the clock for boiler emergencies across Winchendon, Gardner, Athol, and the surrounding area. When you call, someone answers.

Honest Assessment on Repair vs. Replace — Older boilers can often be repaired cost-effectively and kept running for many more years. We do not push replacement when repair makes more sense. If replacement is the right call, we explain exactly why and give you a clear picture of the cost and benefit before any decision is made.

Locally Owned and Accountable — Shawn and Julia Shelly own and run this business out of Winchendon. Every job they take on is tied directly to their reputation in this community. You are working with people who care about the outcome — not a regional contractor managing dozens of crews at once.