Radiator sizing

[stokecity]

does anyone know a quick method of sizing rads without using a mears calc or a computer program. an old plumber once told me cube the room up in foot then times 5 then this is BTU.....something like that anyway

 

[Gray0689]

But not accurate with modern sizing heat loss ect

 

[kirkgas]

does anyone know a quick method of sizing rads without using a mears calc or a computer program. an old plumber once told me cube the room up in foot then times 5 then this is BTU.....something like that anyway

this method is only a very rough guide and doesnt take into account the differences in the type of room, or of a real allowance for heat loss and each house type is different, how quickly do you want to do it, with a mears calculator it will take about 10 mins to work out the exact requirement, then remember to take into account the delta T adjustment as the rad lists use a specific delta T you need to adjust to suit the actual delta T you have for each room

 

[Dannypipe]

I always times by 4 for my rough estimate. 5 sounds way to heavy.

As said, get a Mears Calculator, or if that sounds like too much effort, there are some pretty accurate online calculators.

For instance try this beauty.

Free Online Boiler Installation Estimate and Heat Loss Calculator

 

[kirkgas]

I always times by 4 for my rough estimate. 5 sounds way to heavy.

As said, get a Mears Calculator, or if that sounds like too much effort, there are some pretty accurate online calculators.

For instance try this beauty.


Free Online Boiler Installation Estimate and Heat Loss Calculator

maybe x5 was for a bathroom, with allowances taken off for the cooler rooms, but still not very accurate

 

[AWheating]

the free online calculator on the city plumbing website is very accurate, i have checked a couple of my free hand calculations against it and it was very close.