All brands, any installer
Cape Coral Solar Water Heater Pros repairs solar hot water systems of every brand and age across Cape Coral and Southwest Florida. Pumps, controllers, sensors, mixing valves, glycol loops, collector leaks and backup elements are the everyday work of our repair visits.
Since 2010 we have serviced systems from installers that closed years ago, so an orphaned SunEarth, Rheem Solaraide, drainback or batch system is familiar ground. The most common failure we find is also the quietest one: the solar side has stopped working and the electric element has been heating the tank for months.
We diagnose first, give you a written price, and fix most problems in the same visit with parts on the truck.
Symptoms
A failing solar water heater usually shows up as one of five symptoms, and the first two are easy to miss because you still have hot water. Match yours below, then call us with what you see on the controller display.
Lukewarm water on a sunny day points to a pump that runs slowly or not at all, a controller set wrong, low glycol, or a failed upper element if it happens at night too.
This is the most common hidden failure: the solar loop has stopped and the backup element now heats the whole tank. A dead pump, a failed sensor or a tripped breaker can cause it, and the water feels normal.
Water on the garage floor, stains on a ceiling under the roof lines or a drip at the collector can come from failed unions, pinholes in copper or freeze damage. A wet tank base often means a fitting, not always the tank itself.
A blank display, an error code or an impossible collector temperature, far below freezing or far above boiling, usually means a dead sensor or broken wire. The controller then never tells the pump to run.
Overheating shows up as scalding taps, a T&P valve that drips or hisses, or loud knocking in the roof lines. It usually traces to a stuck mixing valve, a stalled pump in a closed loop or a controller missing its high-limit setting.
Repair scope
Most solar hot water repairs involve one of five component groups, and we carry the common parts for each. The cards below explain what fails, why it fails in Southwest Florida, and how we fix it.
The circulating pump and its controller are the parts that wear out first, often around year 10 to 12. When either fails, the collectors sit idle and the tank quietly runs on its electric element.
We replace AC circulators such as Grundfos and Taco units, swap failed differential controllers, and fit matching DC pumps on PV-powered systems.
Most controllers read a 10K thermistor at the collector outlet and another near the bottom of the tank. We meter both, because a 10K sensor should read about 10,000 ohms at 77 degrees F, and replace whichever one has drifted.
We also test the backup element and its thermostat, and reset the element timer so it stops heating water the sun could have heated.
A stuck check valve lets the tank lose heat to the roof overnight through thermosiphoning, and a failed freeze valve leaves a direct system exposed in a cold snap. We replace both with matched parts.
Solar tanks can climb well past normal water heater temperatures, so a working thermostatic mixing valve is your scald protection at the tap.
We repair leaking collector headers and fittings and replace cracked tempered glass covers where the absorber plate is still sound. Insulation on the roof lines breaks down in Florida UV, so we replace that as part of the repair.
If a collector is beyond repair, we replace it with an SRCC-certified flat plate.
Propylene glycol slowly turns acidic, especially after the loop has overheated, and dark or sludgy fluid attacks pumps and heat exchangers. We check freeze point and pH, then flush and recharge the loop.
A loop that keeps losing pressure can point to a leaking heat exchanger inside the tank, which we confirm before recommending a tank swap.
Repair vs replace
Repair almost always makes sense when the collectors are sound, even on a 15-year-old system. A well-built solar water heater lasts about 20 years, but the pump, the controller and sometimes the tank wear out around year 10 to 12.
Use the table as a rough guide; we confirm on site and put the options in writing.
| System age and condition | Usual recommendation |
|---|---|
| Under 10 years, any single part failed | Repair the part |
| 10 to 15 years, pump or controller failed | Repair, and replace the other moving part if it is the same age |
| 10 to 15 years, tank leaking | Replace the tank, keep the collectors |
| 15 to 20 years, sound collectors | Repair or replace the tank as needed |
| Collectors leaking, glazing clouded or a new roof coming | Price a full new system |
When the tank is the problem, our solar water heater tank replacement service reconnects your existing collectors. When the whole system is worn out, compare a new solar water heater installation before you spend on repairs.
The visit
A repair visit takes 1 to 2 hours and follows the same checklist every time, so nothing on the system gets skipped. You get a written price before any repair starts.
We ask what changed and when, then read the controller: collector temperature, tank temperature, pump status and any error code. Those readings usually point us to the right part within minutes.
We check the collectors, glass, fittings, straps, roof penetrations and pipe insulation, and look for freeze or storm damage. On closed loop systems we test the glycol.
We confirm the pump runs and moves fluid, meter both sensors, and test the check valve, freeze valve, mixing valve and T&P valve.
We test the backup element and thermostat and look at the tank for leaks or rust. You get the written price, and we make most repairs in the same visit.
Pricing
Most solar water heater repairs in Cape Coral cost $150 to $600, plus the $149 diagnostic, which is credited to the repair when you approve it during the visit. Prices below are installed, 2026.
| Repair | Typical price |
|---|---|
| Diagnostic visit | $149, credited to an approved repair |
| Controller or sensor replacement | $150 to $550 |
| Backup heating element or thermostat | $225 to $400 |
| Glycol flush and recharge (closed loop) | $250 to $450 |
| Circulating pump replacement | $350 to $600 |
| Solar storage tank replacement, 80 gallon | $2,400 to $3,400 |
| Solar storage tank replacement, 120 gallon | $3,000 to $4,200 |
| Collector glass, valve and line repairs | Written price after diagnosis |
Price rises with roof access on steep tile, discontinued parts that need an adapter, and repairs that combine several failed parts. Replacement parts for solar systems are exempt from Florida sales tax, and the solar water heater cost guide covers what new systems cost if you are weighing replacement.
Where we repair
We send repair technicians from Cape Coral to homes within about a 30 to 45 minute drive. Response time depends on distance, and no-hot-water calls jump the queue everywhere.
Usually within 1 to 2 business days, from the Southeast Cape to the Burnt Store corridor.
Usually 2 to 3 business days for solar water heater repair in Fort Myers and North Fort Myers, where many older systems are still running.
Usually 2 to 3 business days in Lehigh Acres, where well water makes scale and element failures more common.
Usually 2 to 3 business days in Bonita Springs and Estero and in Punta Gorda and Port Charlotte.
FAQ
Here are the questions we hear most often on solar hot water repair calls.
Yes. We repair every brand and system type, including systems whose installer or manufacturer is no longer in business.
Usually the backup element is doing the work. Either the pump or controller has failed, a sensor is misreading, or the element runs all day when it should only run in the evening.
If the tank itself is old and scaled, the element works harder still, and a new tank through our solar storage tank replacement service may be the fix.
Yes, but have a technician do it. We isolate the solar loop with its valves, set the controller so the pump stays off, and leave the tank running on its electric element.
Closing the wrong valves on a direct system can trap pressure in a hot collector, and a stalled glycol loop can overheat in full sun.
Most can be repaired. Pumps, controllers, sensors, valves, elements and glycol are all replaceable parts, and sound collectors often outlast two or three tanks.
We test it at every annual service and replace it when the freeze point or pH is off. Many systems go 3 to 5 years between flushes, and any overheating event shortens that.
Book a repair
Tell us what you are seeing and what the controller display says, and we will book a diagnostic visit, usually within 1 to 2 business days in Cape Coral. No-hot-water calls and active leaks go first.