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Discuss Grant Oil Combi Boiler Hot Water Efficiency in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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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?
 
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.
 

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