Recent content by RyanDonovan

Thank you! The heater, along with the filter and pumps, is under a metal roof without walls outside. Maybe some rain blows into the heater enclosure during very windy storms.

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...