172. Support: Heat rise for Spa Controls with an electric heater.

For heat rise experience, your system will operate with one of the following configurations: A covered, 300-gallon spa will experience a heat rise approximately as detailed below: 120V - The heater will operate on demand at 1500 Watts during low speed pump operation. It will automatically shut off when the high-speed pump or blower is activated. You can expect a heat rise of 1 F to 3 F per hour. Heat rise is a little bit less for 1000 Watts heaters. 240V - The heater will operate on demand at 5500 Watts during the high and low speed pump operation. It will continue to operate when the blower is activated. You can expect a heat rise of 6 F to 8 F per hour. Heat rise is a little bit less for 4000 Watts heaters. For an 11,000 Watts heater, you can expect about double the heat rise of a 5500 Watts heater. NOTE that the heater housing will NOT be hot to the touch on initial start up. Cooler or Lower Water Temperature is passing through the heater keeping the heater housing cool. The heater housing will gradually get warmer, similar to the water temperature from the tub. Wait at least a couple hours or run time to determine the heat rise.