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Did you use the serial number of the boiler when ordering the cartridge? there were several versions, three to be precise.

Have a look at the mid and top range Vokera Synergy and Pinnacle. Now part of Carrier Group which includes Viessmann and Riello sharing technical and service teams. 7 and 10 years, modulation from 1.77kW up to 35kW dependant on model.

Your point about the battery pack running the boiler is sound and if enough to tip the decision for oil is fair comment. Especially if you experience frequent outages. I have no idea of size and duration batteries will operate a burner and circulator. £700 sounds very reasonable.

Forget cooling, for that go AC. Your bills will definitely be higher if you changed to HP and run the system the way you do but if the system ran continuously with possible increase in radiator sizes (not always necessary as many are oversized) it would be cheaper but that statement has the...

It's the refrigerant that gives the higher temps, R290 (propane) up to 75C but at that temp it'll have a COP OAT 7C of 2-ish. R32 will give 65C OAT10, 60C OAT -5deg. The highest temperatures are not the target, the lowest that maintain com fortare the best because the COP improves so if your...

That would rather depend on the OAT the COP was calculated at

As long as your ceilings are between 7'6" and 8'6" 11kW sounds fine in traditional calculations. If you're running a heat pump 24/7 maybe a little lower.

This is on my easiheat-i in the training room, polarity unimportant.

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I don't have mAnuals here but look at parameters, one, I think in the 7's group will be enabled/disabled OT, that needs to be 1.

I haven't read all the posts but when it's at design temperatures, say -1⁰C or whatever run the heating to get the whole house comfortable and in a steady state the read the meter over at least an hour, longer is better. Divide consumption by hours and that's your property heat loss. Don't put...

Looks like the diverter valve cartridge behind the actuator but picture is not great. Not expensive and possibly best to replace both cartridge and acuator, any local installer can do this. Vokera will do this for you for a fixed price but a local guy might be cheaper.

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.