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Change the boiler and leave all the rest. In 40 years the vented system will have had a fraction of the maintenance that would have been required with an unvented system and performance would have been adequate or they would have changed it to unvented already. Unless there's another specific...

Speak to an expert contractor regarding AC, it's perfectly possible to have the condenser on the balcony and the internal unit supply hot water, a split system. I work for Vokera, part of the Carrier group which includes Toshiba AC. I've no expertise in AC personally. Ring Toshiba on 01372 220...

I'm told the smart heads are coming but know no more than that. I use Hi Comfort OpenTherm plus weather compensation wired to the boiler. It sounds like it might be the Vibe Max boiler as that came out around then.

What model Vokera is it? I have the Hi Comfort control, it works fine. Not the most intuitive to use or prettiest room control but there's no need to go to it with the Hi Comfort app. The predecessor, the BeSMART was excellent but let down by the servers in China which were incredibly...

It is that simple but I can't guarantee the evohome will control domestic hot water temperature. It didn't use to but HW may have updated it. You can definitely do what you want to, write back if there's an issue with DHW temperature. There's a workaround. 10 to 15% improvement is an internet...

If you see marks like this around CN5 you'll need a new PCB I'm afraid

Well it complied when installed but would not with a new boiler installation now. When you replace the Unica Max is a straight swap.

It's certainly beneficial to have a thermostat fitted whatever the boiler. What model Vokera is it, I might be able to offer specific advice as I work for them. There is a data badge, often difficult to read, on the underside of the chassis base. You might need to photograph it to read the model.

Not following completely but the two OT connections from Tado go into the OT connections on the controls interface, that's it, you need do nothing else. The clock will still show alarms etc. but not have any influence on the boiler. CN 5 control is ignored once OT is connected.

Afraid the videos are gone, they asked me to remove them. I know little of Tado except that some time ago they removed bus control from the system in the UK and it became on/off only. I understand Tado is still OpenTherm in Europe, it depends where you buy it from. For the time being you could...

Many times, or was standard for me, pumps lasted 25 years. Strangely enough it was Myson tech suggested it when I was discussing their Aerjec air separator. Never did anything else after.

Only that it worked for me many times over decades and I serviced them and checked the F&E. Oldest would be 27 years, probably still in but my customer moved a couple of years ago .

That's because I actually wrote it yesterday or the day before and forgot to press post, oh well, better late than never

The compression couplings around the pump pipework indicate there's been previous issues. Do not extend the vent into the F&E water. Personally I'd remove the pipework around the pump and make sure it's clear visually then re-run the cold feed from the F&E cistern in 22mm and tee it into the vent.

You shouldn't really be offered a choice as the Building Regulations for new systems stipulate radiators should be sized for a heat pump temperature regime even if a boiler is being installed so it's a straight swap later. Emitter surface 50 degrees, internal air temperature 20 degrees, delta...

If it's an S there is no preheat as that's available only on a combi. The TA link may have been left in on the pcb. Any lights left on or flashing on the front panel?

My post, which I have forgotten about, was dated 2019, 4 years ago! Yes, I heard last year the flexible flue had been discontinued, not through a problem, simply there was so little demand. As I work for Vokera it pains me to say there are other manufacturers that may be able to assist, try...

Listen to the manufacturer, if they say not together then OK, make your choice. Wait till winter, whatever your occupancy lifestyle and preference run it OT for a week reading the gas meter and noting comfort before during and after then switch to WC doing the same thing the following week and...

Vented: Simplicity Gravity I had 30" from tank base to rose pressure flow no problem, no pump. Insulate and move gate valves once a year leaving them fully opened then turned back a rotation. Cost both initial and ongoing is cheaper. Unvented: Cost, both initial, ongoing with increased water...

Yes, that's what we do on basic boilers, simpler but chalk and cheese. If it gets the job done however, go for it.