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Pre-heat function on boiler question

View the thread, titled "Pre-heat function on boiler question" which is posted in Boiler Advice Forum on UK Plumbers Forums.

Hi everyone I have a question which I hope to get advice on:
  • Live on 2nd floor flat
  • Boiler: Vokera Easi heat 25c combi boiler
  • Water supply: Incoming water for hot and cold water is via the mains water supply
  • Boiler on kitchen wall is about 10 metres from bathroom
  • Single mixer taps in kitchen, bathtub and bathroom basin
There is a pre-heat function on the Domestic Hot Water Dial on the boiler, I turned it on jus to see how hot the water gets and the water was the coming in at 55 degrees Celsius. When I touched the hot water flexi pipe it was roasting so my questions are:

Is it safe to leave the DHW setting on the pre-heat setting and what is the main purpose of it?
Will the flexi pipes be able to handle the hot water temp they are less than a year old throughout the flat.


Thanks for your time and any information would be great thank you 🙂
 
Pre heat function works by keeping the water upto temp so when you open a hot tap you don’t have to wait for it to heat up the water before you get hot water
 
Pre heat function works by keeping the water upto temp so when you open a hot tap you don’t have to wait for it to heat up the water before you get hot water
How do you turn it on and off?

Is it on when there is a "P" displayed on the boiler display?
 

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