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Very few differences, might be a little more insulation in one over the other or a preheat or special hot water function etc. The difficulty is I get pre-production ones in the training centre often and the software and finish may be tweaked to suit sales afterwards so difficult to confirm.

Delta T pump not as useful in a system running at low temp, less headroom plus it doesn't work with OT. The Unica Max is discontinued, it has the pump but will not modulate low enough for you. The Synergy and Pinnacle do not have a rear pipe kit although you can mount them on batten, the excel...

The excel-i is 25 or 29kW and a Vibe Max with bits taken off made exclusively for Wolseley. No filling loop, Wi-Fi socket, manual dongle, bluetooth timer, less insulation in the casing. Depending on the model they'll modulate to below 3 or 4kW. It will have if my memory serves one fewer pre-heat...

To be absolutely clear, when you say anti-cycle OP that would mean no firing for 25 minutes, the system circulator will be turning the whole time. The Vaillants are quiet, you not going by sound are you but by watching the flame icon? I'm not sure how one can maintain the load however, it is...

As Muggles. It really was an excellent finish.

That would depend on the hysteresis above and below the setpoint and duration of the anti-cycle delay if there is one. Better boilers allow adjustment of all three to suit an installation if the installer can be bothered.

I'm afraid all Vokera boilers follow the original specification for OpenTherm which read the control must have complete control of the boiler which was interpreted to include DHW too in the case of a combi i.e. no adjustment on the front fascia. It has changed since. A workaround is to connect...

Cheaper to rely on gravity, less maintenance and your pipes are the right size. Just upgrade the cylinder and make sure yoou have a Bylaws kit on the CWS cistern.

I didn't catch what you have at the moment, is the new system a complete new system? you have four opinions at the moment but ask for more to clear confusion when more options and opinions may or not help. I'll stick my oar in. If you have a CW storage cistern in the loft and a hot water...

What boiler? There's a list of boilers containing asbestos on the HSE website and instructions on how to safely remove and bag the asbestos then hope your local tidy tip accepts it, some don't.

With a gas appliance, say a combi boiler change; upon completion the installation is notified to Building Control as being installed to and complying with the prevailing regs by the installer who, being Gas Safe registered is deemed a competent person. Would an electric boiler require notification?

As title. I had the discussion the other day and was told a fixed electrical heating appliance such as an electric boiler does not require notification. I believe it does. Am I incorrect?

Mid terrace is good unless neighbours are a nuisance somehow. First floor in three storey buildings better still. That's not what the op wants however. Heat-Engineer and use the estimator not the in-depth survey option. Close enough or if the ceilings are not too high use L x B x 100 = watts

Just be glad it was a 40, the over gassing would have been greater if a lower output.

Get another heating engineer or do it yourself if you have time and a tenner. Use Heat-Engineer software. You'll spend a day but you'll have an accurate heat loss calculation.

Yes, there's a relay included with each system boiler that allows switching to WC flow temps when DHW stat is satisfied. I don't have the diagram here but a call to tech should be able to source one.

Vokera Vibe Max; actually any Vokera but the other models may be physically too big, the Vibe Max is a cupboard fit.

You've probably got the older metal flue but the add-ons I believe should still work. Vokera part 20142842 plume kit or 20142841 45 degree plume diverter. Tell her the flue consists of CO2 that plants convert to O2 and H2O which plants need to survive. The condensate is slightly acidic so...

I would say I have no doubt that flue is asbestos. Depending on your local authority they may accept it double-bagged and sealed at the local tidy tip, some will not and reject it out of hand. You need to wet it, remove it without breaking it or creating dust then use the correctly labelled bags...

Glad it's sorted