Electric boiler and an unvented indirect hot water cylinder

[DavidB]

Hi, I have recently purchased a cottage with an LPG combi boiler (no mains gas in the area). I intend to replace this with an electric boiler and an unvented indirect hot water cylinder.
The boiler will run four radiators and the hot water cylinder. The cottage has one bedroom.
What size (kw) would I need for this system, I was thinking that a electric boiler with an output of around 6kw would be enough.
Your thoughts please.
Many thanks
David

 

[ShaunCorbs]

What are the output of the 4 rads ?

 

[SimonG]

Heat loss calcs. Amperage on electric mains coming in.
Otherwise you're just urinating in the breeze.

 

[yunchong]

If you have six radiators, you should get a 9 kW electric boiler. This rule may vary depending on how high your ceilings are, whether you have single or double glazing and how effective your insulation is.

 

[Ben-gee]

In fact it’s not a rule at all, it’s just bullsh*t

 

[Knappers]

If you go for HW priority then you'll get away with just your CH requirement. Otherwise you'll have to add a few kW for hot water.