Installing an immersion heater with a combi

[Mike A Skinner]

Hello

I’m looking for some top line advice on installing an immersion heater in conjunction with my Worcester Bosch 440 CDi High Flow Combi boiler. I have solar panels and a battery and currently export about 400kwh a month. My plan is to use the immersion heater to reduce my hot water bills when I’m producing surplus electricity rather than send it back to the grid.

My boiler currently supplies all my hot water and heating. Would it be possible to plumb in a unvented cylinder to supply hot water and what do I need to consider. I’ve been in touch with Worcester Bosh and they have advised its not possible to pre heat water for the 440Cdi. The plan would be to perhaps use the immersion heater during the summer months and switch to the boiler when I have the central heating on or I’m not generating electricity. Any advise would be greatly received. Thanks in advance. Mike

 

[ianmcd]

Pre heating with that boiler is not advised by the manu some boilers are designed to do exactly what you want

 

[muggles]

It'll cost a lot more to do than you'll save

 

[OvertonPlumber]

Save the money for when the highflow goes wrong and it will trust me

 

[Mike A Skinner]

Save the money for when the highflow goes wrong and it will trust me

It was fitted last year with approved filter and WB installer and has a 12 year parts / labour warranty so I'm well covered

 

[flameport]

Would it be possible to plumb in a unvented cylinder to supply hot water

Yes, in the same way it would be connected to a heat only boiler.
G3, notifiable work and all the usual.

Would make the combi part of the boiler redundant, unless you kept that for one or two outlets near the boiler and used the cylinder for everything else.

I have solar panels and a battery and currently export about 400kwh a month.

What are you importing per month - if it's anything significant a bigger or second battery would be a much better option.

 

[SpecialK]

Intasol Combi Diverter Valve - Intatec

The intasol combi diverter valve enables solar heated unvented hot water cylinders to be linked with a combi boiler. In the event the hot water temperature in the cylinder dips below a usable temperature, the valve diverts this water to the combi boiler treating it as a pre-heat. The valve then...

www.intatec.co.uk

If you have an MCS certificate just get paid for the export on octupus flux etc?. You will make more money than the cost of gas.

I just have 2 ball valves on my hot water. One on the unvented outlet and one on the combi. I turn the combi off during the summer.