Heat Pump Vs Natural Gas Heater

[RavenNS]

Estimating Heat Pump Swimming Pool Heater Costs and Savings
For an outdoor swimming pool, use the following tables ( see link) to help estimate your annual heat pump pool heater costs and savings compared to using an electric resistance or a gas pool heater.

http://www.eere.energy.gov/consumer/.../mytopic=13220

There are lots of thread on this topic ( do a search)
here is the most recent:
http://www.poolforum.com/pf2/showthr...4862#post34862

[cleancloths]

Check some of the online vendors that sell heatpumps, most have a comparison chart of energy usage versus gas heaters. I've had my heatpump for 8 years and would never consider a gas heater.