Replacing storage heaters with wet system

[yebaws]

Hello,

I'm about to replace electric storage heaters with a wet system and need to size the radiators. Storage heater ratings are 2.55Kw, 3.4Kw and 1.5Kw. It occurred to me that rather than just replacing them with radiators having the equivalent output (which seem quite large to me) I could probably get the same effective output from smaller radiators as the storage heater ratings presumably refer to the power consumption when they are charging up, which they're only doing about half of the time, so the effective rating over a 24hr period might be about half of their nominal rating.

Would appreciate some advise please.

 

[Rob]

Do a heat loss calculation for each room. 3.4 kW is quite a lot from one room but if required it would be wise to spread it out a bit.

 

[denso13]

http://www.homesupply.co.uk/radiator_output_calculator.php

 

[OwainDIYer]

you tend to need larger radiators than storage heaters, as central heating is switched on and off, and you need a fast warm-up response from cold when people come in from work at 6pm rather than having the house already warm-ish from the storage heating continually losing heat in the background.

Also modern condensing boilers work better into a larger radiator load with a lower return temp, although they will modulate down if required.