Here is the problem - we have a solar pool heater. Whilst the 'heat' is solar and thus free, the pump uses electricity and thus isn't. We also don't have a pool cover. So over the last couple of weeks the pool has been slowly heating up during the day, but cooling over night. Most nights are about 15 degrees. Thus the pool hasn't actually got warm enough to make it worth while getting in.
So here is the question - when does it become viable to run the heater?
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