Hi,
I'm hoping someone can help with my dilemma about replacing the current CH system.
The property is a 3 bed victorian semi in London, with a loft conversion giving 4 bedrooms. We have 1 bathroom (with bath and overhead shower) plus a shower room in the loft.
The previous owner has fiited a 24kw combi bolier which is on its last legs and needs to be replaced (and moved).
At the outside tap, water pressure is 2.5 bar and the flow is about 18L/min (bucket method).
It looks like we still have the original lead mains and 15mm pipe in the cellar.
So my questiion is whether to replace the combi with a more powerful vaillant version or go for the more expensive option of a system boiler with unvented cylinder (say 210 litres). I appreciate that with the low flow and pressure, neither option is going to give great performance but I need to replace the current bolier with something.
One suggestion is to go for the unvented cylinder option now, which would give us flexibility to improve performance by replacing the mains feed at some point in the future. In preparation for this the plumber will replace the internal 15mm feed with 22mm.
I've looked at the Vaillant 937 as an option, but think its probably too big, although if that's the best option we could probably squeeze it in.
Any thoughts or suggestions would be appreciated!
Thanks.
I'm hoping someone can help with my dilemma about replacing the current CH system.
The property is a 3 bed victorian semi in London, with a loft conversion giving 4 bedrooms. We have 1 bathroom (with bath and overhead shower) plus a shower room in the loft.
The previous owner has fiited a 24kw combi bolier which is on its last legs and needs to be replaced (and moved).
At the outside tap, water pressure is 2.5 bar and the flow is about 18L/min (bucket method).
It looks like we still have the original lead mains and 15mm pipe in the cellar.
So my questiion is whether to replace the combi with a more powerful vaillant version or go for the more expensive option of a system boiler with unvented cylinder (say 210 litres). I appreciate that with the low flow and pressure, neither option is going to give great performance but I need to replace the current bolier with something.
One suggestion is to go for the unvented cylinder option now, which would give us flexibility to improve performance by replacing the mains feed at some point in the future. In preparation for this the plumber will replace the internal 15mm feed with 22mm.
I've looked at the Vaillant 937 as an option, but think its probably too big, although if that's the best option we could probably squeeze it in.
Any thoughts or suggestions would be appreciated!
Thanks.