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Looking around the internet it says that unvented systems need to be installed by a G3 engineer. That sounds impressive but it just a one day £90 course than any tradesman could easily do, it seems your guy hasn't bothered to learn. I installed my own system about 11 years ago and the building inspector wasn't bothered about it then. The annual maintenance check is very simple.
Charlie_L-
I have read a fair bit since my previous post and to be fair there seem to be powerful combi these days that have integrated tank and can deliver 25l per minutes. That seems to be sufficient for a 2 bathrooms/15 radiators house. We will have 3 bathroos but one will be in the utility room and will most likely never be used at the same time as the others.
I see these builders point though. Megaflo needs more than 1 bar to work as intended but thames water is only required to deliver 0.75 bar or something. So if water pressure ever drop to that the megaflo becomes irrelevant. This is what happened to his dad a couple of years ago apparently, water pressure in his area dropped from 6bars to less than 1 making the megaflo a huge unecessary expense.
Aldersbrook
We have just had a plumber in to quote us a new heating system for a 5 bedrooms house with 3 bathrooms in london. So far we have been told megaflow is the way to go for this size house but this plumber recommends that we install the storage boiler instead and that if we wanted to go down the megaflow route he would even turn the job down.
His argument is that he installed megaflow in his dad house few years back and it was great until the pressure dropped and made the megaflow system worthless. He thinks that eventually water pressure will drop in most part of town with new build being built at every corner. He reckons a storage combi boiler will cost half the money and do the job just fine. Any view on this?
At the moment we have approximately 3bar pressure coming to the house. Megaflow needs at least more than 1.5 bar pressure to fully function. Thames water minimum pressure is something is like 3/4 of a bar.
Personally we could do with the cost saving and a cheaper installation but the last thing we want is to struggle with 2 taps opened at the same time.