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Heat pumps are more energy-efficient than electric boilers. This means that, when set up in a suitable home, heat pumps will be cheaper to run than electric boilers. While both heat pumps and electric boilers are currently more expensive to run than gas, if electricity and gas prices balance out in the future, heat pumps could be the most economical option. The cost of professional installation is typically similar for gas and electric boilers too, assuming like-for-like size and type of boiler. The exact costs will depend on the complexity of the job - changing a boiler's location will add to the cost.

See the best heat-only boilers as voted for by owners and heating engineers. Controls to use with combi boilers What are combination boilers?A diverter valve is not required in system and conventional boilers as the hot water they produce is stored in a hot water tank for when it is needed. There are a variety of flow switches available, depending on the type of system they’re installed in, and each one may work slightly differently. The main types are:

There are two types of heat-only boiler. The first is supplied by cold water from a cylinder that sits high up in your home, usually in your loft. Cold water then flows down from there to a gravity-fed hot water cylinder, where it's heated and then sent around your home. A paddle flow switch is the most common type of switch. It is a spring-return switch with a sensor that can monitor the flow. The switch will close when flow is present and open when there is no flow. Your boiler will keep repeating this process when the water temperature drops, this will mean your boiler is using fuel and your heat exchanger is being overworked. This will waste money on fuel bills, increase carbon emissions and decrease the lifespan of your heat exchanger. A faulty thermostat will not be able to sense when the water temperature has gone over or below the predetermined point, so your boiler will continue to operate way past where it should normally stop heating. In addition, the overall size of your home, the number of radiators, how well insulated it is and your hot water needs (whether you run multiple hot water taps at the same time, for example) will all also affect the size of boiler you need.You may also have a faulty flow switch that’s causing the problem. You should get a suitably qualified engineer to take a look at your system to determine if there are any major reasons why your boiler isn’t turning on. Below are some common reasons why your boiler may not be starting up: Simply put, a diverter valve works by redirecting the water in the combi boiler to respond to your hot water requirements, whether you have just turned on the shower or switched on a radiator. Why does my boiler keep turning off? It’s likely a recurring boiler fault which we’ll diagnose in this article. There may be a simple solution to fix boiler faults. However, you can read the results of our 2022 boiler survey of 9,722 owners and 196 boiler engineers below. We gathered results for two brands: EHC and Heatrae Sadia. Our scores are based on owner satisfaction, reliability over six years, and the opinion of Which? Trusted Traders.