Sizing a boiler

[Hugh]

Hi all

whats the correct method for sizing a boiler?

is it all heat loss calculations added together?

all help welcome

 

[prs1]

Depends for a modern condensing combi they call it the whole house method is perhaps the simplest. still to long to go into,try checkin it out on the net.
hope this helps good luck

 

[WHPES]

Simple guide here:

http://www.eeph.org.uk/uploads/documents/housingbuildings/ce54.pdf

 

[Puddle]

I always just knock next door and see what they have in,if they have jumpers on,you up size from that,is just shirt or blouse,about right size,if wearing string vest with hanky on head ,down rate boiler,system works a treat....

 

[fuzzy]

i find out what size of boiler is on offer at the merchants and then suggest that size and make.
all rads plus hot water plus 15percent for initial heat up should do the trick

 

[Hugh]

Thanks guys for all your coments
I just wish i could knock on the house next door to check out their boiler,
im actually have to size 2 boilers for a leisure centre for my building services assignment.

cheer's for the help

 

[doitmyself]

The Boiler Size Calculator will tell you what size boiler you need, if you have a hot water cylinder.

If you are installing a combi boiler, the size is determined by the cold water flow rate. You should allow 2.5kW for each litre per minute flow rate.

You can check the cold water flow rate at the kitchen sink using a bucket (most have litre markings on the inside) and a watch.

2.5kW/litre/min will give a temperature rise of 35C, e.g. from 10C to 45C. This is more than adequate for baths and showers. Installing a larger boiler will make the water hotter; it will not increase the flow rate.