MrPotts

Mine is an older Greenstar 24i which doesn’t have a digital display just the old fashioned dials. FWIW mine is set by the dial to 65c but rarely gets above 60c at the flow pipe, not great accuracy but better then you are experiencing.

My boiler delta between flow and return is also around 10c after the boiler has been on for a few hours and it doesn’t cause any issues. I have a WB Greenstar system boiler though.

With the radiators getting to 52c isn’t that hot enough? My radiators normally get up to around 50c (with an 65c flow temp set but never reached) and are very hot to touch so I wouldn’t want them any hotter.

I think Opentherm can be very hit or miss due to the “standard” not being particularly standardised amongst boiler manufacturers. I would second @JohnMo suggestion and try running wiser in on/off mode, at the end of the day heating is about comfort not necessarily about running the latest flavour of heating control. BTW I forgot when posting my comment that you were running OT, in that case I would expect Wiser to be constantly firing the boiler and the cycling periods to only be relevant to on/off mode.

You are looking at the wrong sensor for for when Wiser requests the boiler to fire, you should be looking at “Wiser Heating” sensor.

The “industry standard” backplate will only fit the gen1 Wiser hubr, the gen2 hubr uses a slightly different backplate.

I think a scop of 4+ is needed to breakeven the cost of gas v's electricity.

Why does everyone keep saying that the cost of installing a heat pump is getting close to the cost of installing a gas boiler when it isn’t true. The cost to the customer may be near the same but the overall cost is still at least four times higher to install a heat pump due to the BUS grant. When the BUS grant ends there are going to be a lot of unemployed heat pump engineers and company closures.

Deleted

Add me to the forgotten list! Age is getting the better of me 😩

Shouldn’t it be written as (35-(5/2))-20?

We are spending billions on renewable energy whilst at the same time paying renewable energy companies millions to turn the supply to the grid off whenever the wind is too strong or the sun to bright. This is all added to our energy bills!

If electricity prices were the same as gas prices then would the case for an expensive heat pump diminish in favour of a direct replacement of a gas boiler with a much cheaper electric boiler? Then there would be no need to change radiators, pipework or the HW cylinder and no need to give away £7.5k of tax payers money per install. In fact the money could be used to provide the electric boiler for free!

What I don’t get is how can it be said that spending 10’s of thousands of pounds on solar and battery so that you can power a heat pump that also costs thousands of pounds is cheaper than keeping your gas/oil boiler. It would likely take a lifetime to recover the initial investment wouldn’t it?

Considering that Google will not be releasing the gen4 Nest in Europe I’m not surprised Google are removing other elements of the system. Below is a quote from Google Nest Community Blog………. Nest thermostat updates for Europe Heating systems in Europe are unique and have a variety of hardware and software requirements that make it challenging to build for the diverse set of homes. Therefore moving forward we’ll no longer launch new Nest thermostats in Europe. With our Google Home platform approach we are enabling a wide range of established smart thermostat companies to build energy devices and experiences that cater to these markets. The Nest Learning Thermostat (3rd gen, 2015) and Nest Thermostat E (2018) will continue to be sold in Europe while current supplies last. These models will continue to receive security updates and you can control them via the Nest and Home apps. https://www.googlenestcommunity.com/t5/Blog/Support-changes-to-our-earliest-generation-Nest-Learning-Thermostats/ba-p/713068