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Yes, I had a similar question on here about a month ago and the overall response was that of 'if it ain't broke, don't fix it'. I think I may have jinxed it because it went into lockdown mode yesterday & I had to reset it a few times before it would light.... Which I'm assuming won't be a one...

Feel free to hijack the thread as much as you all like! The debate is still interesting!

Thanks again for the information. Budget is flexible, but having had no quotes yet, that was just my initial thinking! Having said that, as it sounds like it's going to come in at substantially over 5k, I may just keep the funds aside and defer the project (unless of course the current...

Oh wow. Very many thanks for such a detail list of recommendations! I have been looking online at some of the options you suggested. In honesty, I hadn't heard of this Vokera, and they don't seem to have the best rep(?) so I think I might prefer to stick to something like WB, Valiant, or...

Thank you for your suggestions. I assume this will still be based on an unvented cylinder and an advanced boiler that does clever things to save gas!

Yes and I'm sure there is no way my existing gas pipe is going to supply a 35kw combi, which is another reason I want to plump for a cylinder again!

Thanks. Yes, that's another thing that puts me off a combi. It's firing up every single time you turn the hot tap on. That's got to put wear and tear on it's internals. I tend to use hot water little and often I'm one of those who washes up the mug after every cup of tea/coffee, or the...

So what I'm thinking then, is I could save gas bills on a new boiler. Not because a new one would be more efficient, but would be better specced to the requirements of my home, and not overpowered? The lowest one I've seen is 12kw for a system boiler, but I assume they would modulate down...

Oh yes. I understand the developers at the time (Taylor Woodrow, or something like that) installed them in new estates by the thousands, because they were so quick and easy to install... So I imagine they got a huge discount!

I assume the 24kw on the current Potterton is more for heating the hot water more quickly, than it is for the central heating?

Thanks, well according to Zoopla the flat is 55 square metres. Being a relatively new build (2006) and on top floor, the EPC rating is B.

Thanks, yes I'm sure it takes no longer than 10 minutes to heat my existing (85L) water cylinder. This is from the instruction book of the existing Potterton All the apartments in the 3 blocks were fitted with this 24kw Potterton. It's not a large flat, I have 2 bedrooms (one is tiny) and an...

Ah I get it now, so it's all to do with recovery time. Not an incredibly importantly factor to me, as long as the tank is big enough to fill the bath... By the time I'm out the bath, it should have reheated again if I need HW for anything else. P.s. I am in Nuneaton, just next to Coventry.

Thanks for replying. Yes I was thinking about 100L would probably be about right. I must admit, with the Potterton, the hot water tank does recover very quickly, usually after 10 mins I have HW again. But that's a bit of a faff so I generally just use the kettle to top up the bath. Either...

Yes I agree about waiting until later in the year (It'd be madness to do it in the winter & leave myself with no heating!) I know BG are going to be costly. It'll be a complicated job with scaffolding required, etc. So I'm not sure local GSRs would be willing to take it on! I suppose a quote...

Thanks for your input, yes I know it's not regarded as a very good boiler, even though it's served for 20 years and still going strong. 24kw seems high for a system boiler, I think? Surely I wouldn't need that.

Yes, there is. I notched it up a bit today actually, it doesn't give degrees on it, just a + and -, it's about 3/4 of the way, and tap water is scalding hot, but still couldn't really get tonight's bath as hot as I'd like. And for your second comment, that's why I was surprised my Potterton...

Yes, it looks like it is. So I guess it's already pretty efficient. Interesting to see that it's described as a 'Combi' boiler, and 24.0kw.... Being as it heats a tank, why would it be a combi? And does that mean my gas pipe is at least ok enough to power a 24kw combi?

Also does anyone know if a Morden day boiler would be much more economical / running costs wise than a 20 year old Potterton?!

Thank you for replying. The BG guy said gas pipe would likely not be sufficient for a decently enough combi to give me the hot water flow I currently have. As it is a long run up 3 flights then all the joints etc. I am the only person living here, so two outlets at once would be impossible...