Due to nerve damage I need water therapy (physical therapy in water at about 89F).
I have an indoor, inground pool and have had a series of Hayward natural gas heaters. They always seem to leak 1-6 months after the warrantee is up. Looking back over bills for about 15 years, we've had to pay roughly $1000 per year in parts and labor. They always claim that, "You had too many leaves wash into the pool," sorry, but it's indoors, there have been no leaves. Nobody in the region seems to carry anything else. The problem is that there are no local repair people who either show up or do competent repair and the closest official dealers don't want to drive 2 hours out into the middle of nowhere.
Is there a way of replacing the pool heater with something far less expensive to replace, like a residential water heater? An on demand heater that just runs constantly? Remember this is indoors so the weather isn't an issue. I realize it would take a long time to heat up, but being indoors, there's not much exchange of heat with the environment so it's pretty stable.