Getting the Best From Your MasterTemp 400 Heat Exchanger

If you're staring at a puddle under your heater or the water just isn't getting warm, your mastertemp 400 heat exchanger might be crying for help. It's easily the most critical—and expensive—part of your pool heater, acting as the bridge where the fire meets the water. When it's working right, you've got a spa-like experience in minutes; when it isn't, you've basically got a very large, very heavy lawn ornament sitting on your equipment pad. ...

May 6, 2026 · 6 min · Karmina Olof