On 09/03/16 20:55, Chris Hogg wrote:
On Wed, 9 Mar 2016 20:30:15 +0000, Tim Watts
wrote:

On 09/03/16 19:15, Chris Hogg wrote:

You say about a boiler "Use the manufacturer tables to ascertain power
output and then double the size over what it needs to maintain steady
state (or what you think it needs)", and you also give ball-park
suggestions for the wattages needed to heat some rooms, e.g. 3-4kW for
a large bedroom. Do those figures include the doubling factor,

yes - that's includes padding.

Thanks. So a 20kW boiler will be just fine.


Plus hot water

I'd say 20kW will be too weedy.