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It's got an awkwardly large footprint to be fair yes. Was originally a 1950's bungalow but extended upwards a couple times. As it had so many rads in total due to the above, it was either go for a commercial size boiler, or have multiple boilers which i've obviously opted for the latter...

Very interesting read thanks. Coincedentally it will be running 14 rads of similar size to that. Most will be type 22, some will be the designer type triple column, cannot recall if their BTU requirements were higher or lower than the type 22's. Though the engineer did say oversizing is better...

you'll laugh, but the current boiler up in the loft is a 40kw conventional boiler with unvented cylinder. It was powering 24 rads (10 x type 11, 14 x type 22) and struggling quite a bit over the winter to keep the house super warm. Plus costing us an absolute fortune to run....plus plus, as...

He is doing a heat loss calc. I said its got CWI, i wouldnt go so far to say its really well insulated. Loft was done by me over the winter. Still need to finish off the sub floor insulation (it's a 1950's house)

Fortunately not, it has a cavity and CWI :D. But the current boiler ain't quite able to heat the entire house efficiently. So zoning it that off just to cater for the top 2 floors, and adding this new one for the ground floor (ground floor will have 14rads, all either double panel or triple...

very helpful thanks, i'll check it out. To be fair the guy that came round is a gas engineer but as i've had so many dealings over the past few years with folks that 'talk' a big game... i think it's always good practice to double check this stuff now a days. It's on the larger side yeah, had a...

Hi all, Trying to verify ive been given the correct info here (oppose to what's convenient for the installer) Having a new boiler 36kw system boiler installed which will be 3-4M or so away from the gas meter, with id say about as many 45/90degree turns in it. (3-4). Installer has suggested...

Yep, insulation is in hand regardless. None of the pipes were lagged in the cold loft space. A good 80m or so in total. Now all 22mm 19mm collar lagged and wool over them. Most loft had 100mm insulation, some had zero!… now has 300-400mm apart from the super difficult to access areas. Sub...

Decent argument for both I guess. Option 1 - Split Zoning ground floor / upstairs - seems expensive as someone will need to access the sections of the CH flow / return that T Off and run down the wall cavity to the ground floor. And from advice on this forum is ultimately no different than me...

Quick one on this, did a measure of hourly usage earlier, it didnt add up to what I thought it would in light of your advice, and it's left me a bit confused. In early Jan I wanted to see how much M3 the boiler was using per hour when running the Central Heating, I measured it was using about...

Good to know, we were umming and ahhing about the work required to have the zoning implemented, alternative was to use those HIVE thermostats on each rad. But due to the length of the runs from the boiler to the ground floor and the fact that we had to have it piping hot flow, I think we’re...

I see....and that's the same in the case of a conventional CH only boiler like mine? (not a combi)

So in theory you can never buy a boiler that's "too big"?..... Do i need to run it efficiently for it to be able to modulate down like that? or can I still run it on MAX and see it modulate down? And...(again sorry if stupid question)..... Instead of Zoning, if I just went and turned 12 of the...

Thanks for explaining that. I have a potentially silly question about the inverse of that. Looking into zoning the property, for simplicity of maths lets say of the 24 rads that currently come on when I turn the boiler on, Lets say If I split it into 2 zones, (Zone 1 = 12 rads Downstairs...

very Interesting, and thanks so much for looking into it for me, I used a couple of calculators, to be fair one of them said it was based on T60 one said T50 and the outputs came out the same...so I thought it was likely either one of them was wrongly titled. I'll put the links of the...

Thanks again - I’ll take a look at the return temp if it’s possible to see it in a config menu shortly. If I add that many rads then put it back to full temp though, in real life terms what will happen? Boiler damage?

thanks Thanks - so in logistical terms, If I’ve calculated the current setup to be 38kw at T60. If I drop it to 70C can I add some more rads? Also I’ve tried it at 70c (about 3 o clock on the gauge) for the past hour or so. Two rads on the ground floor are decently hot, all the rest are id...

Makes sense, couple questions off of that then to make sure I understand correctly. :- If I drop the flow temp to 57c (down from 84c) to run the rads at T30, can I add a load more rads into the property as the output of each would be lower than current (t60)?.....and.....what would happen if I...

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Yeah that's right, as those rads are advertised with the /3 different BTU/3 wattage outputs. Is that basically saying, if I run my boiler at 85c flow temp, i should use the T60 calculation for wattage? and use the T50 if I run my boiler at 70C? Really appreciate the help, the ones that came...