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Re: i have a new coates heater and it takes 3 hours to...
Make sure the water flow is the same and the size of the heaters are the same. it sounds like the new one might not be the same kw. there really isn't a solution to the heating not being the same if you have good water flow and the kw is the same as the old one.
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20 to 30 minutes.
if this is a pool and spa combo system, then you are not only sucking water from spa and returning only to spa!
you have a incorrect setting of the valves. It needs to be 100% suction from the tub, and 100% return of water to the tub.
Usually spas heat approx 5 degrees an hour. If its been a day or so and your water isn't up to heat, you probably need a new heating element in your spa. Check the voltage at your heating element, and on your topside there is usually a heat indicator light that should be lit. If it has correct voltage at heater and the indicator light is lit, heater burned up. If you have incorrect voltage at heater check fuses for a possible blown fuse and see which pump it goes to, that could be your problem.
All depends on the amount of water in the spa or pool, and the size of the heater in BTU's. The time for "Heat Rise" will vary and the answer you are looking for can't be provided with amount of info you provided. But if a general rule of thumb - the closest answer: Spa with a gas heater, 1 degree about every 90 - 120 seconds. Electric heater (vary's by KW) on average: cold to hot = 8-13 hours. Swimming pool with gas heater (no suggestion for electric) about 1 degree temp rise every 90 minutes.
Yes, the jets will run anytime the heater is operational. This is neccessary to keep the plumbing from melting, and also to evenly distribute the heated water. Most hot tubs only take 4-5 hours to heat up, but the easy spa takes very long because they use a very small heating element. Usually only 1.5KW.
This spa is heated by waste heat from the pump. The manual says it can take up to 20 hours to get to 100F. I assume that is starting from 60F. Keep the cover on and let it run at least a day and you should have 100F+ water temperature.
This is a common problem and easy to fix. Your temp sensor screws into the front side of the water manifold. You will just get a new one and swap it out. Your book will show you just where it is, but it's the size of a 1/2" plug on the top front of the manifold when you take the cover off the heater. Good luck.
Along with the exchanger you will need header gaskets, manifold gaskets, Pressure switch and tube, igniter or pilot and maybe a temp sensor. I count on all of these when I do an exchanger, total cost about $300.00 Now your over a grand. Labor about two to three hundred, if nothing goes wrong, and hopefully it all get's done right. Now your up over half of a new one and 90 days on parts. I know I make money at this but I make money at rebuilding heaters also. I usually try to get people to go towards the new heater.
Then take a course in pool and spa chemistry. 99.9% of the time this is the cause of a bad exchanger and that is what hurts the other components at the same time.
something is wrong with the voltage it should be 240 when you test the heater terminals, i think the heater relay isnt making a good contact. but i would check for 240 at the main panel and chase the wiring to find the voltage drop.