New radiators... or not?

[Deleted User]

Powerflush the system is a must. Your heaters will be fine. Actually had new boiler amd powerflush on 18 yr old system 3 years ago. Works a treat. Chemical flush of system wont be enough.

BUFF

FreeBear said:

BUFF said:

FreeBear said:

BUFF said: Bear in mind that as ThisIsWeird said you can also "upsize" a radiator in terms of output by adding another panel of more fins (you can now get T33s with 3 panels & 3 rows of fins) - this comes at the cost of increased depth rather than increased width or height.

n.b. unless they are very recent when you replace your combi also look at whether replacing your controls is worthwile. Control upgrades will usually more than pay for themselves over the life of a boiler by way of energy savings.

A type 22 radiator will stick out from a wall by about 145mm, a type 33, around 200mm - In small rooms, either is going to look real ugly (in my opinion). When replacing radiators here from type 10 (flat panel, no fins), most of them were type 21 with a single type 11 in the hallway.

The rad that "cannot be upsized due to lack of space" is in the lounge so presumably not a small room.
I have a small (500x600) T22 in my smallest room, I don't find it ugly let alone "real ugly".

"ugly" is personal opinion - I prefer a slim look that doesn't protrude from the wall too much, so a T21 is about my limit.

Agreed, but I would much rather go a few cm deeper than go much wider or taller to get the same output.

fenwick458 said:

Just putting on bigger radiatorss isn't necessarily going to future proof it, you'd need bigger pipes too, and better insulation. I'd focus on the better insulation

Depends what pipes are fitted just now. If it is microbore then for a heat pump certainly going up to something like 22mm would be advantageous.& you probably need 28mm main feed to/from the heat pump itself but that can be done at the time of the heat pump install itself. Meantime the larger rads will let a boiler happily heat the building at lower flow temps & if it is a condensing boiler that will improve efficiency too.