I purchased a pre-owned home in early 2014 that came with a pool and spa, including a Mastertemp 400 heater. I recently opened up the heater for the first time and found considerable rusting on the "tank" that contains the heat exchanger near the exhaust pipe and on the exhaust pipe itself.
<a href='http://postimg.org/image/rinx48juj/' target='_blank'><img src='http://s1.postimg.org/rinx48juj/IMG_20151125_101851_1_Copy.jpg' border='0' alt="IMG 20151125 101851 (1) Copy" /></a>
View image: IMG 20151125 101828
I took the following actions:
- sand off as much rust as I could with steel wool
- apply "Ospho" to the rusted areas
- patch hole with JB Weld
I've run the heater a bit now and the patch seems to be holding.
I suspect that some of the rusting may have been caused or accelerated by the hole allowing exhaust to vent into the body of the heater, but that doesn't explain why there was a hole in the first place. Does anyone know what may have caused this hole and/or rust? Any recommendations for other immediate maintenance? Any recommendations for ongoing maintenance to extend the life of the heater?
I have an in-ground chlorine pool.