On May 23, 2:46*am, wrote:
I'm thinking of installing a heat pump for my 15x30 pool.

I'm told that the correct unit for my needs (an Aquacal TropiCal) puts out 112,000 BTUs (40 amps/5.8 KW). *I'm thinking that a larger unit that puts out 141,000 BTUs (50 amps/6.4KW), would heat the pool quicker and require less time on, thus use, in theory, less electricity - but it's about $500 more expensive than the small unit. *We'll probably only use the pool on the weekends. *Not sure how long it will take to break even on this with running it for only a couple days per week.

Anybody have any thoughts or opinions about this? *Is my thinking skewed? *Is it worth the extra cost?

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You would be better getting some sort of solar heater.

Running a swimming pool is always going to be expensive.
Gas would be far cheaper than electricity.
Electricity is the worst possible option.
If your pool is near the house you may be able to use the home
heating furnace if you have a wet system.
You need a good insulated pool cover. Ideally there should
be insulation between the pool and the ground too.

The economics of turning a pool heating off are very dodgy
as it takes days for the pool to reheat.
Reducing temperature may be an option.

Your incoming power supply may not be big enough in any event.
You may need a three phase supply.