This restricts the water passing through the boiler until the water has reached temperature. If wait times are a real problem for you, we recommend you fit a device called a combi save instead. not be covered if misused or not serviced as per maintenance instructions. Scroll down the page to find your make and model. Worcester Bosch Highflow 400 Electronic PCB 87161023390 Genuine Part NEW. Most Worcester boilers come with the pre-heat turned on, so you will need to turn it off. Thank you for purchasing a Highflow 400 Series gas-fired combination appliance. In this blog we cover turning off Worcester pre-heats. The Worcester Bosch Highflow 400 ELECTRONIC OF installation manual can be downloaded for free by clicking on the link below. However it uses a lot of gas! The boiler will come on every 90 minutes and uses small amount of gas each time, but over the year can add up to around 500-750kWh (about 5-10% of the average household's gas bill) if it is not timed. This keeps a little hot water prepared in the boiler and so cuts down the time it takes for hot water to come out of the taps. Some boiler manufacturers have added a 'hot water pre-heat' function to their boilers. You can save around 5-10% on your gas bill if you turn the 'pre-heat' off on your Worcester combi boilerĬombi boilers are often tucked away in far corner of the home and it takes a long time for the hot water to reach the taps.
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