Hot water system query

Martyn_H

I have two choices when my boiler eventually needs replacing:
1) Boiler with hot water tank/ immersion heater (I already have this).
2) Boiler that heats up water when you turn the tap, like the old 'Ascots.'

Option 1 means I can use the immersion heater as back up if the boiler goes wrong, but with a 40 minute wait.
Option 2 means instant hot water, but with no back up.

I would like to know:
Which system is cheapest to run given the huge increases in energy costs?
Will the performance of my non- power shower be affected by having option 2?
I understand the law insists that condensing boilers have to be fitted now. Are they compatible with each option?

I would be grateful for any advice.

Thank you,

Martyn H

silvercar

Option 2 is cheapest as you are not keeping a tank full of hot water just in case you need it.

I know you can't have a pump on the shower with a combi boiler (option 2). You should have a reasonable flow though, we do.

I would guess that condensers are compatible with both, plenty people replace their boiler and keep a tank.

I don't know how important a back-up is to you. Most people would think a kettle and a bath, or a trip to the local swimming pool showers, would be OK.

Fleeting_Glimpse

If you have only one bathroom and no en suites ect then go for a combi and poss have a electric shower as a back up.

plumb1_2

silvercar wrote:

Option 2 is cheapest

What is your proof?

silvercar wrote:

I know you can't have a pump on the shower with a combi boiler (option 2). You should have a reasonable flow though, we do.

What if the OP has a Low Pressure Valve

silvercar wrote:

I would guess that condensers are compatible with both, plenty people replace their boiler and keep a tank.

True

Martyn_H

Thanks for your views so far.

Martyn_H

Any further advice welcome.