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So, to paraphrase. You've done lots of research on the internet. You've hacked off your supplier and the boiler installer, to latter wants nothing more to do with you. You've got another installer to quote, changed your mind again, got him to quote for a third option. You've returned your...

Opentherm compatibility is an issue that adds complexity, some risk, for very little benefit.

You have accepted a specification and presumably that is what you have paid for. No manufacturer insists on a Powerflush, I can save you the time ringing round. In any case, your particular horse has bolted. You seem to have received what you wanted; If you now want a Powerflush, I'm sure...

Evohome can save 30% of your energy bill. It can make your lounge warm in the evenings without boiling the rest of the house, and it can warm your bathroom towel rails in the summer. Programmable TRVs can't do that because they can't turn the boiler on and off. Compare a condensing boiler...

Too old and fragile for a Powerflush. Ha ha. You have been mugged over; he hasn't got a powerflush machine.

Sounds like he wired it up incorrectly, as there is an external demand for heat indicated on the display. Sounds like a bit of a quick and dirty job to me; hope he's going to register it for you or you wont be able to sell the house.

In terms of what works with OpenTherm; I'd advise you not to use it with Evohome. The benefits offered by OT are minimal anyway, in comparison to the savings Evo can deliver on its own.

An experienced, time served boiler installer would not usually fit a customer supplied unit. The gas safe exam is multiple choice, many ticket holders just fit the occasional hob and usually do bathrooms. Some know virtually nothing about heating systems. You've only got to look at some of...

RWC are large Australian company who make a huge range of products.

If you have bought the boiler, you will have a very limited choice of installers to fit it. Most installers aren't interested in fitting a customer supplied boiler.

You will be unimpressed with their heat output. Don't be persuaded by the figures; most of the heat ends up next to the ceiling. God intended radiators to be horizontal for a reason. Manufacturers love them because, at the moment, they can charge mugs more for the same thing up the other way.

This particular installer wouldn't use it on his customers. Fernox every time. It will be double the money, but pay the price, do the job properly. Many other pros on here would agree. Hope our customers appreciate it. If your installer is using this stuff, you can be assured that...

The reason the Megaflo needs the air gap replenished is that it is a design that doesn't work. They patented a floating frisbee inside that was meant to prevent the water and air mixing; they are so certain this doesn't work, and fed up with homeowners calling them, that they now print...

You can't fit a pump to your uniSTOR, it is against water regulations. You can fit any shower designed to work on an 'unvented' system; however I would advise you to choose one with a modest flow rate* if your water supply is a bit limp. Be aware that the performance of both units will be...

Well Vaillant do, and they clearly haven't consulted you first, Tony. They have been doing it over 10 yrs, so perhaps you have been away for a while. As I never tire of saying, Intergas are the latest in a long list of domestic boiler manufacturers who have saved money by ditching the diverter...

No offence taken

You can use a Vaillant combi boiler for HW only with the CH pipes disconnected and capped, or turned off under the boiler. Assuming it is an ecoTEC combi, eg: 8 series, with an internal filling loop. Eg: standard model 2004-2106. We've used them as standalone water heaters in the past. The...

Fair enough, a sample of one isn't representative.

I would get a boiler fitted from a brand you have heard of, preferably recommended by people you know, rather than people you don't know on the internet. Pop back here in 7yrs time and see if you made the right decision. Might not be representative, I link here for a bit of balance...

There speaks a man who has run a Gas Safe or OFTEC registered company. Or is he just a know-all with an opinion on everything?