Radiator size

[bongos]

Good evening!

I need a replacement radiator in my bathroom. I took the old one out months ago due to a leak in the actual radiator. Unfortunately I didn't make a note of the size of the old one but it did heat the room fine.

Having been on several BTU calculators, I am getting a wide variation in the BTUs required to heat the room - anything between 1325 and 2701!!! After looking at this previous post it seem this is fairly common.

Can any of anyone give me an idea on how many BTUs I actually need to heat my bathroom!

L = 2.3m
W = 1.8m
H = 2.3m
Walls = 220mm solid brick
Roof = flat roof with 50mm insulation
Floor = solid concrete on ground floor
Window area = 0.9m²
Outside walls = 3
North facing = No

Thanks.

 

[Nige F]

Can you do it in imperial and give me a day to get my Mears calculator back from my M8

 

[bongos]

Can you do it in imperial and give me a day to get my Mears calculator back from my M8

No prob Nige!

L = 7' 8"
W = 5' 11"
H = 7' 8"

 

[fanboy]

Hope this helps.

1.Measure volume of room in cu.ft. i.e length x width x height.
2.Multiply by 5x for living rooms/dining rooms, 4x for bedrooms, 3x anywhere else.
3.Add 15% for rooms facing north.
4.Add 20% for french doors.
5.Deduct 10% for double glazing.

This will give the required BTU for your rad.

 

[bongos]

Hope this helps.

1.Measure volume of room in cu.ft. i.e length x width x height.
2.Multiply by 5x for living rooms/dining rooms, 4x for bedrooms, 3x anywhere else.
3.Add 15% for rooms facing north.
4.Add 20% for french doors.
5.Deduct 10% for double glazing.

This will give the required BTU for your rad.

Hi Fanboy. It does help but there is no mention of the adjustment for three outside walls.

I think this is the main reason I am getting such varying calculations from the online guides.

 

[holty]

try heatweb.com or co.uk. they have flash tools.and one is for rad calcs.i use it,i compare it to my mears gauge now and again and theres not that much of a difference.

 

[kevindgas]

by using mears i come up with a requirement of 3600 btu taking in the solid floor and 3 outer walls which bump the heat required up considerably.

 

[kevplumb]

1 kw or so

had to blow the dust off mine

 

[fitz1]

4038 btu

 

[glasgowgas]

i make it 1027 megawatt


















i`ll get ma coat

 

[kirkgas]

600mm high x 700mm stelrad k2 (1.2kw)

 

[kevplumb]

i make it 1027 megawatt




















i`ll get ma coat

yev put the decimal point in the wrong place

plonker

 

[bongos]

Cheers for your advice guys.

I also had a figure of around 3850btu in mind - it's somewhere in the middle and seems to be the result of the calculators that offer more options when you crunch the numbers.