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Large bore, no cross welds or manifolds or constrictions. The retarder makes it 2 pass and ensures the flue gases engulf the whole of the tube, throughout it's length.

Look at the book to see if there's an adjustable anti-cycle delay, if so, lengthen it. Also check to see whether the boiler can be range-rated (heating output reduced from maximum (you might need an engineer to do this).

Ignition speed at firing to ensure reliable ignition (higher than minimum) then it rapidly modulates down dependant on the flow and return thermistor readings. Once alight the fan speed can reduce but ignition has to be reliable. Fan speed determines output and that will not rise above 60% of...

Both the software and heat exchanger are different between the Vision S and the Vibe Max. The latest software starts the boiler at 60% of the range rated output and that’s the max for 15 minutes. In that time the flow temperature will modulate but the max output is capped. If demand...

No problem but I always work on the principle the OP is not the only reader.

Yes, pump runs during anti-cycle to stop overheating in the heat exchanger. Wider delta T is more difficult to acheive as the boiler modulates flow temperature as the 'headroom' reduces. A slower pump would help but it wouldn't be much difference to fuel costs.

Any of the boilers you mentioned originally or have been named subsequently will ensure your wife is comfortable. All you have to do is get a good installer that likes the boiler he's fitting and the rest will be plain sailing. As always however, the devil is in the detail.

Using that graph from a boiler with an unusually powerful pump for Vokera on the Y axis you see the available head. Below you see flow rate on the X. To get the flow rate for a condensing boiler installation multiply the specific heat capacity of water by the temperature difference across the...

You do have a point but I try to offer advice and answer a direct question and not simply name a boiler. The advocates of other brands can answer your questions about their suggestions as they have the figures to hand otherwise it's just a model and brand that you have to research yourself in...

We'd have nothing to answer if you knew more:giggle: A three bed semi needs around 8kW. If a combi try to find a boiler that can be range rated to what you need for the heating. Look at the residual pump head for the boiler at 70%. In 15 and 22mm the head loss around a system is under 1.5m...

Just remember, of you are connected OpenTherm the heating and DHW selectors on the front of the boiler are disabled, adjustment of both has to be carried out on the room control.

Yes, the TA connections. Your version of BE SMART is not one that could e connected to the servers anyway with a £80 accessory. Your thermostat can be converted from ON/OFF to OpenTherm but you need to open the receiver and alter wiring.

Interesting that much of the conversation is about pensions and not the students, facilities or the job generally. I did three years part time when recovering from illness. Many students didn't want to be there but were pushed by their parents. The good ones tended to be mature with a young...

Afraid I have no immediate solutions other than suggest you look for a control that fits into ErP control class 7 ClassVII Weather compensator and room sensor, for use with on/off output heaters: A heater flow temperature control that varies the flow temperature of water leaving the heater...

We don't sell the PDHW boiler in the UK so use a Vokera system boiler with EPH controls on OT and that's the way to do it.

Hang fire on that phone call please, service are not in the loop yet, I'm making enquiries.

It would be poor if you were correct but you are not; they work fine without operational servers. Mike Swannick, I don't know that they have, I just guessed.

I believe they're turning the BeSMART server off, they've been too troublesome in China and are now using a new app, HiComfort, free to download locked to Amazon servers. If you get the new gateway box you could throw the old one away and encode your existing BeSMART to the new server. Ring...

Definitely an easi-heat-i? That's only a year old-ish. It does sound like condensate or gas so probably better to call the installer first.

The two cores currently taken into CN5 on the PCB remain unaltered and are now connected to terminals 1 and 3 in the Hive receiver. L and 1 in the Hive receiver should not be linked. Connect LNE of the Hive to the mains supply