I have a 4 year old Waterco 125 Titanium Heat Pump for a 20x40 in ground pool.  I tried turning it on yesterday and found a leak in one of the components inside.  So I read up on pool heat pumps.

The HVAC system’s compressor generates heat by compressing refrigerant. The heat is captured and used for heating domestic water.  For this purpose a heat exchanger is placed in between the compressor and the condenser.  The water that is to be heated is circulated though this heat exchanger with the help of a pump whenever the HVAC system is on.  I found this nice diagram of a pool HP (below).

I'm pretty sure that one of the heat exchanger is what's leaking.  There are 2 heat exchangers on this HP.  It's leaking at the compression fitting on the freon pipe that goes from the 1st heat exchanger to the 2nd one.  It's the feed pipe of the freon in the 2nd exchanger that's spewing water.   The H2O inlet takes water into the bottom of the first exchanger and it's piped over to the second exchanger.   The first exchanger (the inlet one) gets freon directly from compressor & pipes freon over to 2nd exchanger (the outlet one), which is what is leaking.   But it's not leaking freon, it's leaking water (at least it looked like water to me).  After leaving the 2nd exchanger, the freon then goes to an expansion valve.   I know this is a closed system but I can't see the return freon line from the 2nd exchanger to compressor without taking off the unit's fan.  Pics of the unit and the leaky heat exchanger are below.

So I looked at Waterco's troubleshooting guide FOR A DIFFERENT BUT SIMILAR HP MODEL and here's what it says about leaks & the exchanger:

Hot gas heat exchanger: If the leak is at the compression fittings (Arrow 1) and that the elbows are in brass (Arrow 2).  Change the entire heat exchanger.  Do not try to repair.  Here is the pic they provided, below.

But as I look at my HP (and reflected in the pics), it does not have the brass elbows like in Waterco's pic.  It looks like regular copper that has a black compression fitting that connects the freon pipe to the exchanger.   Can this be repaired or do I need a whole new exchanger?  If it can be repaired, is this an easy fix or difficult one?

Also, I kind of don't want to call the pool company; I think they're just going to call in an HVAC guy, which I could do. Can anyone tell me if my HVAC guy could tackle this. What I mean, is it in scope with normal HVAC stuff?

Thank you... I hope to get several helpful replies. Click image for larger version - Name: inside_heat_pump_2.jpg, Views: 64, Size: 72.48 KB Click image for larger version - Name: inside_heat_pump_1.jpg, Views: 60, Size: 72.62 KB Click image for larger version - Name: heat_pump_front.jpg, Views: 69, Size: 132.19 KB Click image for larger version - Name: Screen_shot_2014-03-08_at_12.30.45_PM.png, Views: 68, Size: 112.40 KB Click image for larger version - Name: Screen_shot_2014-03-08_at_12.13.15_PM.png, Views: 67, Size: 263.68 KB
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