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
There could be a few reasons.
The heater has blown a gasket on the manifold.
Improper water chemistry and there is a hole in the manifold.
The water is too cold still and there is a lot of condensation on the initial heat rise. Until the water reaches a certain temp ~ equalizes ~ there will be heavy condensation. If this is the situation continue heating until temp that you want is reached. If one of the previous 2 answers above are chosen then shut the pump off ~ making sure it will not come on again until repairs are done. k
In some instances a plug or sensor located on the header of the heat exchanger is leaking but more then likely if the leak is severe the heat exchanger itself is broken open. There is no repairing a heat exchanger it will have to be replaced and depending on the age of the heater it might be wise to just by a new heater completely.
Either a bad gasket (the rubber between two parts of a component) or some part of the assembly isn't tight.
you find out were the water is coming from after you fill it up with water.
There should be valves to redirect the water to and from the spa. Ken
The same as you would a fresh water spa.
I would go with no less than a 250,000btu. Reason being is the smaller you get the more time it takes to heat the spa thus using more gas. I prefer a 330,000btu. It will heat the spa in 50f water to 100f in approximately 30-40mins.
If you have no hot water, your heating element is out most likely
Most people would want the spa hotter, so in that case there is no way to use only one heater.
a heater/ spa store
I would NOT do that unless I were certain that the spa was built and designed to handle the change. Salt water can do serious damage to components that were not designed to withstand it.
The starting price at Leslie's Pool Supply for a spa heater is $197. The most expensive spa heater is $264. Shipping varies based on the price of the order.
If a spa heater has stopped working or a new one is needed, Amazon has a big variety of heaters. The prices range from about $200 to $10,000 not including shipping.
You need to determine the: gas heater size for the specific pool/spa (with spa use no less than 400,000 BTU). ( how fast do you want the spa to heat to temp?) length of the gas run from the gas meter to the heater pad. size of the gas meter size of the gas pipe at a minimum. Ken
no you need a stronger heater specifically designed for a swimming pool