You can buy electric resistance heaters to suit all sizes of pools and spas but they are not as popular as gas heaters or heat pumps.
Coates offer a large range to cover virtually any residential or commercial application and are a good buy if you want this sort of heater but there are only a limited number of situations where they are advantageous compared to other types of heater.
If you have access to natural gas a gas pool heater will be cheaper to buy and much cheaper to run (although a propane heater will likely cost more than an electric heater).
A pool heat pump is the cheapest way of heating a pool and is the route you would normally take if you want (or need) to use electricity to heat your pool or spa.
Looking at the Coates CHP Range (24 – 30 kw) which you might use for a residential pool, these can be installed indoors or outdoors, are available for single or three phase power supplies and feature a digital thermostat for accurate temperature control. Flow rates are between 20 and 80 GPM and have a built in switch to prevent operation when there is no flow. An all stainless steel tank for long life and corrosion resistance is also standard.
The advantages of an electric resistance heater are:
- Provides its quoted heat output regardless of the conditions – The same applies to a gas heater but a heat pump becomes less effective as the temperature drops and they may not work at all in cold conditions.
- Pollution free – There is no need to worry about exhaust gases or air flow, which means that there is more flexibility in locating an electric resistance heater making it less obtrusive and it may be safer if there are children about.
- Mature Technology – the device should run reliably for many years.
The disadvantages of an electric resistance heater are:
- Costly to run – running costs many times that of a heat pump or a natural gas heater.
- Not as powerful as a gas heater – The Coates heaters range from 1.5 to 300 kw (for comparison purposes this is 5k – 1025k BTU) although the high powered ones are for commercial applications. The models for a residential pool are about 30kw which is about 100k BTU.
- Environmentally unfriendly – unless the electricity is generated by renewable means.
If you have a spa that you want to use in colder weather and do not want a gas heater then an electric resistance heater may be ideal. However for heating a residential pool this sort of heater is unlikely to be a good choice.