I don't know if this will help but to make a long story short, a local AC company told me I needed my 22 year old system replaced at a cost of around $6500. This company tried to tell me my coil was obsolete, that I would need new freon lines, yada, yada, yada. Oh, and of course, a new water heater. When they refused to give me an estimate, I started getting suspicious. To make a long story short, I ended up consulting with a plumber and a heating company that fixes these systems. I ended up paying around $750 for a new pump about 8 months ago. No problems so far. This is the only major expense I've had in 22 years. Can't complain. The name of the company that fixed it is Arpi Mechanical in Chatsworth, CA. If you google them, you'll get their info. Maybe they can help or give you some advice.