We had a solar hot water heater installed five years ago. Our electric bill doubled the first month after it was installed; when we complained they discovered they never turned the system on. Next we found out that the Solartek contractor who installed it connected the hot and cold water pipes backwards. The tank started leaking at the connection, we had to fix that ourselves. We now have a lot of pressure buildup in the smaller tank (not sure what that's called); have had to turn the system off. The local Solartek company has gone out of business, don't know what to do next. And...We have never seen anywhere near the savings promised.