Solar Hot Water Repair
Residential Solar Thermal System & Water Heating Maintenance
Solar Hot Water Repair & Service
Your system stopped saving you money. Let’s fix that.
A well-maintained solar hot water system can run quietly in the background for 20+ years — but when something goes wrong, you feel it fast: cold showers, climbing utility bills, error codes on the controller, or a puddle in the basement. RES Solar has been installing and servicing solar thermal systems across Massachusetts and the South Shore for years, and we repair systems of every make and model — not just the ones we installed.
Common problems we fix
- Failed circulator pumps that no longer move fluid between the panels and the tank
- Degraded glycol that’s turned acidic and is corroding your system from the inside
- Leaks at fittings, expansion tanks, or rooftop connections
- Faulty sensors and controllers that misread temperatures or stop running the pump
- Air-locked or pressure-low loops that won’t circulate properly
- Scaled or aging storage tanks with failing heat exchangers or anode rods
- Frozen or damaged panels after a hard New England winter
- Roof penetrations that need to be resealed or reflashed
If your system is more than 8–10 years old and has never been serviced, it’s almost certainly due for a glycol change and a full tune-up — the single best thing you can do to extend its life.
Why homeowners call us first
We’ve installed more than 600 solar hot water systems across New England, which means we know these systems inside and out — including the legacy brands and discontinued equipment that other contractors won’t touch. We carry replacement parts for most major manufacturers, we stand behind our work, and we’ll always tell you honestly whether a system is worth repairing or whether it’s time to discuss a replacement.
What service with RES Solar looks like
Call or email us with a quick description of what’s happening (or what isn’t). We’ll talk through the symptoms, ask a few diagnostic questions, and schedule a site visit. On the day of service, our technician will inspect the panels, controller, pump station, storage tank, and plumbing; test fluid pH and pressure; and walk you through exactly what we find before any work begins. Most repairs are completed the same day. For larger jobs, you’ll get a clear written estimate with no pressure to commit.
Schedule a service visit
If your solar hot water system isn’t performing the way it used to — or isn’t performing at all — get in touch. We’ll get it diagnosed quickly and get your hot water (and your savings) flowing again.
