Electric element heaters are a very poor choice for a swimming pool, althought coud be used in a spa, the typical time to raise 95 gallons of water with an 11 kw element heater is 1 hour so a 13 x 26 by 4 deep pool would take over 100 hours which would be over 1100 kwh at approximatly 12Cent/kwh us and 11.5 pence/kwh uk giving a cost of about 130 dollars or pound to heat a small pool.

Certikin supply a range of electric pool heaters from the Electro range in 3 to 18 kw sizes. They also supply the Thermalec range in sizes from 3kw to 96kw