Central heating query

[poppet2]

Can someone please confirm the following:

if there are two identical flats, same amount of rooms etc, but one flat has 5 radiators and the other flat 10 radiators and the temperature on the combi boiler is 20 degrees for both flats, will both bills for central heating be the same, despite one flat having more radiators?

In other words do more radiators mean a higher bill?

[Strix]

it could do if they're on an outside wall, but if one of the flats is on the north side of the building and one on the south side...,

 

too many variables really

 

do they both have the same boiler?

 

do they both have the same windows with the same window dressings?

[33ed33ed]

I don't think the OP actually has 2 identical properties.

 

They want to know if more radiators means higher bills...

[paul12345678]

The simplest way to think about it is to take a large pan and fill with 10lts of water nd time how long it takes to bring to boiler then take the same pan with 5ltrs of water and repeat. I think you will find it takes longer/more gas to boil 10ltrs

[poppet2]

This is the theory that I have heard but needed confirmation on.

It doesn't matter how many radiators you have, it's all dependent on the temperature you set. Even if you turn all the valves off or down, the temperature will remain the same while the water runs through all the pipes if you originally set it at 20 degrees.

I can understand the electric bill being higher as the more rads you have the more work the electric pump has to do.

Any comments on the above theory re. the radiators?

[paul12345678]

The electric to run the pump is minimal and i would nite be concert about it. The idea is that the water temp drops exactly 12%c from entering a radiator to leaving it the closer the rad is to the boiler the less flow rate you will need to active this. So the more radiators you have= the more pipe work the hot water has to travel cooling all the time as it flows when it returns to the boiler you will need to use more gas hence more money to bring that volume of water back up to temp.

[poppet2]

The electric to run the pump is minimal and i would nite be concert about it. The idea is that the water temp drops exactly 12%c from entering a radiator to leaving it the closer the rad is to the boiler the less flow rate you will need to active this. So the more radiators you have= the more pipe work the hot water has to travel cooling all the time as it flows when it returns to the boiler you will need to use more gas hence more money to bring that volume of water back up to temp.

 

Yes, this makes sense Paul.

[muddycoffee]

Ignoring any losses from pipework, I would imagine that that the main difference between having double the amount of radiators would be that the heat would be more evenly distributed around the property.

 

If you had a minimum of radiators on the same boiler then the radiators would get hot but other parts of the property would be cooler.

[bonny2]

http://www.aaaultimateplumbing.co.uk

 

if the amount of radiators are undersized for the size of the building then it will take longer to heat up to the desired temp if at all so gas will be in use possibly all the time in the winter months

so if 10 radiators are the desired and recommended amount then the building will heat quicker to the desired temp and be maintained so better and cheaper however if oversized then wasteing energy

[mafya]

http://www.aaaultimateplumbing.co.uk

 

if the amount of radiators are undersized for the size of the building then it will take longer to heat up to the desired temp if at all so gas will be in use possibly all the time in the winter months

so if 10 radiators are the desired and recommended amount then the building will heat quicker to the desired temp and be maintained so better and cheaper however if oversized then wasteing energy

 

I had my system done in the summer, I have 8 radiators in total and changed 7 of them to double ones and a big towel rail. My new boiler is a Vailant eco tec pro 28 and my house is a 3bed semi.

Instead of more radiators why don't you just replace the single ones with double ones.