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Hayward is a very popular brand of swimming pool heater. Raypak and Max-E Therm are other popular brands.
no you need a stronger heater specifically designed for a swimming pool
Input pressure.
You can buy a swimming pool heater in the Burlington, Vermont are at Leslie's Pool Supplies. They have a great selection.
Hayward has a good electric heater. visit www.askpoolquestions.com for more information