My pool is an above ground design that I sunk 2.5 ft. below patio grade. I added the insulated walls during construction before installing the liner. It is an oval 10 by 15 ft pool. About 3500 gallons. I just installed the 11 KW Coates heater. It was a big project since I had to add a new 240 V circuit from my house main panel along with # 6 awg wires (2 power , 1 neutral, and 1 ground) that fortunately fit thru an existing conduit under my paver patio. Added a “spa” box kit at the heater/pump location that has a 240 V, 60A GFCI (that was hard to find). Along with the solar blanket that I already had and we now have 87 deg pool water and expect to continue use of the pool into November. Fantastic!

Heavy duty piece of equipment. Bolted right up. Received as advertised in timely manor.

fast shipping, heater works amazing. heats my spa from 83 to 95 in 45 minutes, simple install.

It’s almost impossible to explain how such a small and compact unit is going to be able to heat your entire spa or hot tub when you first set eyes on this particular system, but thanks to its almost 38,000 BTU capabilities it’s more than up to the task.

I'm so pleased with your heater I tell everyone about it. I have installed over 300 inground spas raypack heaters and Hayward's yours works very well.