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I’ve taken onboard the previous comments watched recommended video - thank you @oldbuffer / @Mister Banks. I’d be very appreciative if someone would be kind enough to take a look and confirm I’ve got things correct. Mindful of a previous observation …… I’ve assumed a U value (2.2) for a solid...

Thank you @oldbuffer & @Mister Banks. I will definitely watch recommended video when home. I’m pleased to read that I’m not far off mark. Q: Would you advocate this approach rather than an online tool; it wouldn’t be too difficult to apply this to each room. I did consider the internal walls...

I’ve been having some mixed results with the various on-line radiator sizing tools. Appreciate it’s not an exact science - but they seem a bit inconsistent and a leap of faith. So I thought I’d attempt a manual check to give me a bearing (or even use as an alternative if it works ok). I’d be...

For system context - brand new boiler; ecoFIT pure 825 combi; 25 kW / 85,000 BTU with two zones: - Z1 17sqm UFH / 16mm pipe under LVT (installed) - Z2 x9 rads all being replaced D

Having searched forum for ‘oversized radiator’ threads. There seems to be advice that oversizing of the entire (combi boiler) system can be beneficial. As I’m changing all my rads - I can do this / fit TRVs If I go through my BTU numbers (on-line tools) and err on side of caution……. - Assume...

I’ve since found that the 300mm high STELRADs I’m looking at, increase in length by big increments of 500mm. So I’m either a tad under spec or significantly over spec output wise. Noting earlier chat / advice - how much latitude do I have on being over spec. Thanks D

@endecotp - yes. By coincidence, I’m looking at STELRAD too. So that diagram very useful - thanks. 450+150=600 cill height, so I’m on limit. I might have to put wooden batten spacers behind brackets as the cill might make access to hang on bracket tricky (as I won’t have a gap). D

Thank you - sounds like 450mm should be okay under a 600mm cill. D

Thanks reply @Madrab. I was meaning extra mm. One of my window cills is at about 600mm. I was trying to work out if a 450mm H rad will be okay. I’m unsure how much I need to allow for pipe work and TRVs. Thanks D

I’m looking to replace my rads; preferring where possible to use a type 22 convectors. I’ve got my heat output requirements and am now looking at size and fit in rad locations. What is good practice to allow extra for pipes and TRVs. My rads are all drop feed on 15mm copper. Thanks D

Thanks for advice. Removed / replaced the aged auto valves. D

I’ll retain the high point air bleeds - thank you @Madrab Just checking I’ve understood (@oilhead ) Because the Auto-vents are so unreliable, a safer bet is to install simple manual vents. So I’m thinking I could cut off the bottle vents and use either this or this. Is it sensible to...

That’s an interesting idea - something like this ? And then bleed them as and when like I would the highest radiator ? D

Thank you - that’s very helpful and with a recommendation . I’ll check the existing vents this afternoon…….. I’ve a feeling that the 22mm flow/returns may have a ‘reducing tee’ and short vertical of 15mm before AAVs. I’m guessing I’d need the 1/2” AAVs - like these ? Thanks again D

Alas no - it’s pretty much a straight line from combi to sink via bungalow loft. It’s the layout of the bungalow - long and narrow. The only thing I could do is improve insulation to help with maintaining temp between drawing water. Capacity wise - I could go to 10L 3Kw; I guess that would help...

Fair point. Maybe I’ll just have to get used to the 1min wait. Apart from costs - what are they like longevity / reliability wise ? Thanks D

Sorry - link didn’t work properly

I’ve got a run of about 20M from combi-boiler to (utility room) hot tap. It can take about a minute to get full hot water to the tap (warming after 30secs). I’m on a water meter so a bit wasteful. I’m wondering about an under sink heater like one of these Aristons . Are they worth a try - our...

I’m in process of replacing my old vented system with new combi system. The old original system had a couple of auto air vents on the 22mm flow/returns in loft. They don’t look in great shape so need replacing or deleting. By the time I’m finished the 22mm flow/returns will be all the remains...

It’s in a very tight spot space wise - it only projects from rear wall by 635mm. I’m wondering if this was done to give flexibility in how it was fitted. The Flush pipe looks larger than 38mm - I’ll measure it tomorrow to be sure. And the radius looks quite tight compared to the ones I’ve seen...