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We are building a new pool. We have our choice between a Hayward heat pump http://www.inyopools.com/Products/02200001004952.htm or a Pentair Heat pump.http://www.inyopools.com/Products/03500014029312.htm Anyone have any opinions on which is better???
Jinx,
When comparing Heat Pumps, you want to look at the COP ratings for equivalent BTU outputs. The COP = Coefficiency of Performance is similar to an Air Conditioners SEER rating. A value of 5.0 is considered good for Heat Pumps. So 5.5 - 6.0 are even better. Greater than 6.0 are super efficient systems.
Also look for Titanium Heat Exchangers, which adds protection to the heat exchanger from water chemistry damage. Cupero-Nickle Heat exchangers will leach copper into the water and will create a higher potential for metal staining.
Finally, consider the ability of the heat pump to operate when the air temperatures fall below 60 degrees. This can create a freezing condition for the condensation water within the heat pump and shut down your heater. Most manufactures offer a defrost cycle that allows the heat pump to continue operating well below air temps that you would want to consider stepping out into (30's).
Another one to consider (if your builder will accept your suggestion) is the largest and one of the oldest heat pump manufacturers, www.aquacal.com.