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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...

Thanks reply. Yes it might do for couple of reasons. I might take pan out so new 10mm flooring goes underneath. If it’s a ‘low level’ I could perhaps get a longer flush pipe and raise cistern enough for new wall holes. I was also thinking of using the existing cistern on a new ‘close...

Hi All, At first glance, I thought I had an Ideal Standard Close Coupled Cistern/Pan. On closer inspection, I’m wondering if it’s a Low Level Cistern/Pan with a (cut) very short flush pipe and mounted very low. Am I correct ? D

I’ve tried to find something better and have had a go with ADVANCED STELRAD STARS. Unfortunately, the User Guide link doesn’t seem to go anywhere - anyone know where to locate this ? There is also a BASIC STARS - is this any good ? Also - looking at this one - seems to give similar results to...

Following the above comment Anyone got a recommendation D

Thank you for reply. Grateful if you could suggest / recommend something that I should use. Best D

I’ve been using on-line BTU estimators for some radiator sizing. I (perhaps wrongly) assumed that the input of room dimensions (LxWxH) was simply to calculate a volumetric area. After getting some inconsistent results - I reversed my L and W dimensions; keeping the same numbers / same room...

Just looking at an older post where someone was asking advice for boxing in pipes in garage and the advice suggested a double skin box (because of Reg’s or control) - is this only because it’s a garage. D

Thanks - that never occurred to me; so it uses the wall as a heat sink. I’ll insulate the pipes as suggested and bin the conduit idea. I might partition the boxing - aiming to keep the pipes and insulation one side / wires the other. Thanks D