Grant Oil Combi Boiler Hot Water Efficiency

[Sara Lowt]

Hi,

We have just had a grant oil combi boiler installed and we have two options to heat our hot water; we can have the water on continuously which will keep the very small water reserve in the boiler at a certain temperature. Or we can have the hot water off and then just boost it when we require the hot water.

Which is the most efficient/cheapest option?

If we do have the water continuously on, would the water reserve be big enough to supply hot water for multiple showers without having to boost?

 

[SimonG]

If you are wanting multiple showers a combi is not the best way to go.
For an oil combi I normally recommend having water on from earliest time in morning till late evening. So from about 6.00 to 22.00.