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Seems like it needs a plume kit to follow the roof line then go up vertical some distance and maybe angled opposite to the path to the window at the terminal.

They certainly used to do a 90° elbow with a wire spring guard in it.

Same, had it years and years. Has easily paid for itself in electricity savings.

connect the fan with a short length of flexi and maybe pad the box with at least 1" of fiberous material around the duct to act an an absorber.

Is this in attic space?

It's not as black and white. The VR700 will show "off" unless the VR920 is calling for heat. The VR920 will call for heat if the temperature is below the set point of any room yes, but also if the temperature is falling towards a set point and/or rising slightly above it. The highest configured...

The vr700 program doesn't matter. The 21° is coming from something set in the Ambisense.

Sounds like a lot of work. Is this in copper or plastic? Get a heat-pump tumble drier, needs no vent and uses 1/3rd of the electricity. Why the electric UFL?

In the '700 installer level (passcode 000), system config. What do you currently have for: Room Temp Modulation Zone Assignment (near the bottom of the list) The '700 will display the highest called for room temp, as set on the Ambisense. If you change it on the '700, the '920 will overwrite...

Also the ASHP will need awareness of outside and inside temperatures to operate efficiency so 3rd party controls are likely sub-optimal.

The clunk is probably a moterised diverter or zone valve. Some do and the only solution is to replace it.

Do you have a VRC700 controller?

press and hold for 3 seconds to change from fixed speed to pp/cp. Constant speed - LED is continuous. PP - LED short flashes CP - LED long flashes

Electricity ~15p per kWhr, gas 2.9p. Design flow 35°C, R290 systems SCOP > 4.8, effective cost per kWhr ~3.1p. ASHP unlikely to achieve that number in practice, but neither is gas boiler 100% efficient; differential is small and that's before the government consider how to get to net-zero, i.e...

if you fit the Ecotec with a weather compensating control, this will reduce the flow temps most the time and hence reduce the cycling requirements from the Wiser. Another option is to fit a time-delay relay to eliminate short cycles then set it to electric mode.

The pressure prevents the evaporation. Water can remain in liquid state far beyond 100°C in a sealed system, and actually this is the reason that sealed storage cylinders have lots of regulations around them. If there were a fault leading to the cyliinder being heated to say 130°C at 7 bar, then...

ASHP efficiency has improved a lot with R290. The outside box needs to be, outside. It cools the air passing through it. Underfloor heating is the perfect use-case as the flow temperatures needed are lower than radiators, which means the heat pump works with higher efficiency ratios. Re...

Most systems have rooms sensors available too as the measurement by the radiator itself is going to be different to a measurement where you happen to be sitting. Systems that have and are connected to use opentherm will achieve better regulation as the output of the system will be matched more...

How about an air source heat pump. You might even be able to get RHI support on it.

I had a similar problem which turned out to be caused by a very oily (and dead) bumble bee. Wait for the engineer.