On 20/01/2015 16:34, harryagain wrote:
"Dave Liquorice" wrote in message
ll.co.uk...
On Tue, 20 Jan 2015 09:18:19 -0000, harryagain wrote:

The big debate with hot water storage vessels in Summer is "Is it
cheaper to turn on the CH or use an immersion heater?"

Why would one turn on the CH to heat the HW? Something very wrong
with the control system if you have to do that.

Costs? Gas 5p/unit 80% effcient = 6.25p lecky is 10p/unit or more...

The debate is about heating a boiler, water and pipework (plus losses from
pipework) up from cold to get a bit of hot water as compared with just
heating the water in the HW store with the immersion heater.

If the boiler is already running for heating the house then obviously it's
cheaper to use it.
But in Summer the economics are questionable.



No. The debate is whether the solar panel will heat the water up before
the CH boiler cuts in.
Gas is cheaper than electricity even in summer.