It depends on what type of heater it is. If you have a heat pump many times the water is just condensation from the air. A heat pump might make 15 gallons of water a day. You can test the water with a pool chlorine test strip and if it reacts it has a water leak from the pool and if it doesn't react then it is condensation and that is normal. If you have a gas heater usually it is a bad heat exchanger that was damaged by out of balance chemicals or PH issues. Then you have to see what part failed. It could also be a gasket, fitting etc. If the gas heater is over 5 years old I usually don't recommend replacing heat exchangers as they are about 1/2 the price of a complete heater.
Marcus
www.poolheatpumps.com
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