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Via Evohome?

Pipe sizing is not the £6M question. Pressure and flow is.

PS: I guess the analogy is asking your dry cleaner whether he can get a stain out of your coat - without showing him the coat.

Worcester expect the system to be clean. All it should have in it is water. The Magnacleanse is OK but if your system was very dirty, the system boiler pump alone and all the radiators on wouldn't make a huge difference. So it depends, which is what WB will tell you tomorrow. A powerflush...

Vaillant are unlikely to ever offer OT in the UK. All it would do is lessen the number of controls they could sell. Generally speaking, the manufacturers who offer OT either; - Don't have the R&D budget to develop their own - Have a manufacturing base or large customer base in the Netherlands...

You can run Evo and VRC470 together, we have done a couple over the last 2-3 years. However, we haven't found a way of integrating hot water into Evo with this combination.

If it is your own house I do not think there is anything to stop you from fiddling with your boiler. Asking for advice on a public forum where pros are requested not to give gas related advice is probably not the best idea. Picking an argument with RGIs on here is definately not sensible - we...

Let us know, would be interested.

Just noticed they are sold by a distributor in the UK and are part of...Ferolli. Best of luck with it. If it is sourced direct from Germany I doubt it can be legally fitted. You can't fit a German Vaillant or Bosch, for instance.

As far as I was aware, appliances have to through a scheme like Advantica testing to be sold in the UK, even if they are sold in other parts of Europe. If I was your installer I'd be ringing Gas Safe to check, before connecting it. Otherwise he will be blamed. Rinnai Japan are the largest...

You could always stick a label on the boiler saying where the discharge is located. We sometimes do this, similarly with electrics if isolation position is not obvious. As long as pipe does not run uphill you are OK.

Crikey, removing concrete to 150mm... NB: There is nothing new about upright radiators. They cost as much to make as the horizontal ones but have a lower heat output, and much of that ends up in the ceiling. Manufacturers love them because they can mug punters into paying twice as much...

Emmeti make a range of manifolds for this purpose, amongst others. I'm not sure you will be improving the system if the copper is OK. If you get any vermin under the floor you will regret that plastic pipe. NB: From an upgrading point of view you will still want to go back to the manifold so...

Does your boiler have pump overrun? And if so, do you have a system bypass?

Yes, and they always know which ones have the copper fins HEX inside. Can't read or write, but can smell copper a mile off.

If you want to reduce gas usage, WC will only make a small difference, circa 5% with the wind blowing in the right direction. Won't make much impact at all on the UFH load, because that all returns low water temp to the boiler. Multi zoning the rads could make a big difference, far more than...

I'm not saying there's anything wrong with Intergas. But for the purpose of balance I'd like to say that Worcester Bosch made their iJunior models with a bithermic heat exchanger from around 1998, discontinued many years ago. Ferroli have been making Bithermic combis for many many years, even...

5 yr warranty with Smiths. More reliable than Myson (we fit them regularly as we're a heating contractor). The smiths uses a temperature sensor on the flow pipe inside the unit, no TRV is needed or should be fitted. Size the unit to be suitable on low speed metrics.

The disadvantage with eBus are the controls are a complete PIA to use. You can run an OSO or virtually any unvented via Vaillant eBus. In my opinion ACV make the best cylinders, but they are not cheap.

In your Oct 2015 posts you said this set up was working fine with respect to the zoning. Perhaps the controls were suitably unfathomable that you didn't realise then? The condense trap shows this system has been running for at least 6 months. We started fitting Vaillant weather comp in 2004...