Prof Matt HannonFeb 4, 2023
Put my name forward for a Tado smart thermostat living lab trial with Energy Systems Catapult. Runs for a year and I get to keep the smart thermostat & radiator valves. Fingers crossed 🤞
https://www.tado.com/gb-en/wireless-smart-thermostat
Reduce Energy with Wireless Smart Thermostat | tado˚

Install your Wireless Smart Thermostat with minimal effort. Follow our online guide to enjoy the benefits of a Wireless Smart Thermostat.

Show threadStephen CrownFeb 4, 2023

@matthannon do bear in mind they’re a bad idea (TRVs in general with the exception of bedrooms) with an Air to Water #A2W based (i.e. radiator/UFH based) #HeatPump so shouldn’t be used, nor pushed.

An open circuit that doesn’t restrict flow is very very important to get the efficiency levels they’re rated & good for.

Take a look at #HeatGeek (Adam Chapman) @petereastern , @kenbone , @stevewebster56 , Nathan Van Gambling for references to this

Show threadStephen CrownFeb 4, 2023

@matthannon @petereastern @kenbone @stevewebster56

I had the Honeywell EvoHome smart radiator setup on all radiators prior to this summer when I got my Daikin #HeatPump installed by Octopus 🐙 Energy.

They also agree with the no smart TRV (or set all to max) approach & instead balance the radiators and UFH.

All controls (incl. smart TRVs) are now gone, with the system running brilliantly efficiently on pure weather compensation control only.

Show threadProf Matt HannonFeb 4, 2023
@Stephencrown @petereastern @kenbone @stevewebster56 so TRVs ok until I go heat pump or bad even with gas boiler?
Show threadStephen Crown

@matthannon @petereastern @kenbone @stevewebster56 have you considered doing an episode for #LocalZeroPod to aid people with best practices for #HeatPump ?

I see you’ve had Nathan van Gambling and Adam Chapman on before, but would be worth having even a segment on this.

Remember: #HeatPump efficiency (from being able to lower flow temperature from say installing more or bigger radiators) is equivalent of other energy saving measures. Subtle.

Feb 4, 2023 at 7:02pmWeb
Show threadPeter MillerFeb 4, 2023
@Stephencrown @matthannon @kenbone @stevewebster56 fyi the lowest performance I recorded from our heat pump / 100yo house this winter was 2.9 when it was -4°C outside. Currently running with a CoP of 4.4 and our average CoP for December and Jan was 3.7. Many heat pump systems have an average seasonal CoP of less than 2.9! Continuous operation with all radiators open with lowest flow temp possible and no buffer all help achieve this.
Show threadSellaTheChemistFeb 4, 2023
@petereastern @Stephencrown @matthannon @kenbone @stevewebster56 Is COP envy a thing?
Show threadPeter MillerFeb 4, 2023
@sellathechemist @Stephencrown @matthannon @kenbone @stevewebster56 it’s like mpg or 0–60 time or engine capacity or GHz I guess, measures we use to rank things, so yes!
Show threadProf Matt HannonFeb 4, 2023
@Stephencrown @petereastern @kenbone @stevewebster56 yes I agree we ought to have a best practice and trouble shooting episode shortly. Give the people what they want!!
Show threadStephen CrownFeb 5, 2023

@matthannon @petereastern @kenbone @stevewebster56

I found one of the really good field trial (Ireland, so very close match to our climate) reports that @paulkenny was involved in and I read a few times to digest.

https://www.researchgate.net/profile/Seamus-Hoyne/publication/340849413_Superhomes_20_Best_Practice_Guide_for_ASHP_Retrofit/links/5ea09ecf299bf143893ff09b/Superhomes-20-Best-Practice-Guide-for-ASHP-Retrofit.pdf?origin=publication_detail

Worth a look, and again this also covers TRVs amongst other great best practice and conclusions.

Hope the share is useful to others.