Longest pipe run from combi?

[BlueLoo]

Cheers Madrab - can you expand on vertical/column rads and why they don't tend to heat up as quickly as conventional rads?

I've taken into account the 22 > 15 > 8mm exisiting pipework and as you say I don't want to upset the system, however there is not alot else I can do to get around this? Can I not just rebalance on the new pipework and rads being added to the system?

Extension area is 8*3m 24m2 it's knocked into existing kitchen that is 3x3 with a small radiator that I could expand on. Therefore instead of adding two new radiators, I could add a large one as the pipework is already run and then modify the existing radiator into a larger one.

According to BTU calcs I'd need around 8000 to heat the 24m2 area space.

I'm here for everyone's experience as I want to obviously take the best approach.

Given it's a kitchen/workspace area and you don't need peace and quiet, how about considering forced air heating from the CHW?
Myson do a range of kickspace or blower units.

Would solve most of your issue here no?

 

[baker332]

Given it's a kitchen/workspace area and you don't need peace and quiet, how about considering forced air heating from the CHW?
Myson do a range of kickspace or blower units.

Would solve most of your issue here no?

Is that not just a fan heater?

 

[baker332]

The way they are constructed means that they actually work counter intuitively to the way convection currents would heat a normal rad. The HW is forced up the first couple of columns and then relies on the flow to force the HW down the others, the HW doesn't really want to flow downwards into all the columns, so it heads down the outside column heading out the return and more slowly down the other columns. Therefore if the flow into the rad isn't the best then it will struggle to move the HW down the other columns, that coupled with the fact that they aren't the most efficient at releasing their heat, again because of the way they are designed.

You could run 22mm > 15mm to them though but finely balance the others.

unfortunately you need to be careful with that too as 8mm pipe is very limited as to how large a rad it will supply properly. I used to have a 1400x600mm K2 on 10mm and no matter what I did I could never get it to warm up properly.

The ideal for that space would have been UFH IMO.

Thanks, I have been quite fortunate so far and upgraded another radiator similar to yours coming off microbore piping and seems to get very hot.

I thought that vertical radiators have baffles in them or flow valves that should enable flow of hot water up and along sections rather than directly out of the return.

 

[BlueLoo]

Is that not just a fan heater?

Sorta.
They use the plumbing instead of the electricity to provide the heat,