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Maybe it's because this forum is intended for technical questions. You did use the word average? .... or did you really mean cheapest.

The same can be said for your remote plate HE.

You put it down to what you like. I think your knowledge is about as intimidating as the spec sheets you recite it from.

You haven't even had the experience of fitting the combi yet.

Steady on gas, you don't know who's fitting it yet.

That's easy. It's the total price of every boiler installation in the world added together, then divided by the number of jobs.

Every engineer knows the method of CH transfer through a plate HE. It's also commonly used abroad where open vent boilers can be linked indirectly to sealed systems. It's unecessary in the OP's case and another example of something you've read for the first time a thought you'd try to be clever...

They lose 0.05622% efficiency per annum and 0.5758% on a leap year. Loss rate is greater when there's an 'r' in the month.

I'm talking about the water-water HE which is far more commonly affected by debris. If the OP's system is cleaned (c/w Magnaclean), the primary gas-water HE is no longer at enough risk to go to the lengths you're suggesting for an 18 year old combi.

Which, at greater expense, just moves the problem from your 18 year old boiler (for which cheap snide HE's are easily obtained) to your new 100kW plate HE..... For which replacements, at any price, are not so easily obtained.

Just because away from your PC and spec sheets you've been, seen, installed, repaired and experienced absolutely F/ALL, don't paint everyone else with your p*** soaked brush. ......I suppose it makes a change from it soaking your tartan slippers.

For a country that has a gas network and over 50m population gas isn't extensively used in France. Nearly every new wet heating technology is based on storing energy in some preheated way, with your love of themal stores you should know this. Higher flow combis have been around for over 15...

Re. France- You must have your eyes & ears shut, Nuclear power has made electric top choice for decades. Italy- Every building over 4 flats. Most people live in apartment blocks or condominiums. As for the rest, they have many combis, but are looking to get away from them. You seem to...

Now that your airing cupboard is a boiler compartment you can't really use it to store combustibles. Furthermore adding heating to the space is not advisable either.

No you're being totally mugged, he should do it for less than half of that.

Maybe, but not for those reasons, Britain is probably the biggest combi market because of price. France are 80% electric, Italy have recently changed back to district heating, Spain is using more solar and Northern Europe are moving ever more towards renewables. Meanwhile back in the UK, you...

There are plenty of complaints with all brands. Your favourite makes sell next to f/all by comparison so can't be properly assesed for failures. There have been many bi-thermic type combis sold and where some give increased reliability they can furr up easier. They're not really better or worse...

As a retired design engineer you should've noticed that the days of bespoke components in combi's are long gone. The extra paid for top brands only guarantees a well advertised badge, scores of suits and hundreds of engineers on the road burning fuel unnecessarily. Any real quality/reliability...

No that's the reason they do like them. What they don't like is having that call on a Sunday or over Xmas if it packs up and the customer has nothing. Of this many people have many years experience. But as you have no practical experience, Drivel, it won't apply, hence your ill-informed...

Hang on, of course the advice given assumes the cause is correct. No-one stands to sell the OP anything.