Gas Boiler

Gas Heaters whether natural gas or propane must be installed by a registered Gas Safe Engineer (with a HBW1 qualification) in accordance with the appropriate regulations. These include the size and position of the flue, the gas supply and ventilation. Some gas pool heaters are designed to stand outside a building in the open, and in this case there is no flue. However sitting is important and again must be in accordance with regulations.

Three separate switches control the heater: A control panel isolator, the on/off switch on the heater itself, the thermostat on the heater, a gas cock on the gas supply
The heater has three safety devices:

- A high limit thermostat, which will shut down the heater if it gets too hot. Once it has cooled down the stat will automatically reset itself.

- A safety gas valve which will cut off the gas supply if the flame or pilot light goes out. In this case the heater will have to be re-lit.

- A pressure switch will turn the heater off if the pool water stops flowing and automatically reset itself when the flow is resumed.

The thermostat is deliberately not very accurate as the pool water passing through it varies considerably in temperature. The difference in temperature between the water drawn from the sump and that from the skimmers is as much as 10°F. The easiest way to get your desired temperature is to turn on the filter pump to run constantly, turn the heater ON, both on the main control panel and the heater, and turn the thermostat to maximum. Put your pool thermometer into the pool water and when that reaches your desired temperature return to the plant room, turn the heater thermostat down to the position where the heater just goes out; the thermostat setting will then match the pool water temperature and will then maintain that temperature in the pool.

Should the heater pilot light go out, re-lighting instructions are usually set out on the inside of the heater front door or in the appropriate instruction booklet. Always ensure that all air vents are clear and/or the ventilation is not hindered.