JonDoe

Given that Nilan UK couldn't be bothered to give me a quote to replace the old interface with a touch one or reply to any of the question above, in the end I decided to integrate the Nilan Compact P with Home assistant and be free to interact with it however I want for a total cost of about £60. Next step will be running the MVHR to make hot water when we have loads of PV energy or the best octopus agile tariff for the day.

Just be aware of triple glazed upvc windows. uPVC is not strong enough so the lifespan of the windows will be greatly impacted. Ours are failing after just 4 years.

before you get to the ducting you have the MVHR system, fan, heat exchanger etc. Also, given that the building should be airthight, there shouldn't be a lot of pressure differential. The cross section of the intake duct is not that big and if the air vent cover is present I don't think this should be a big issue. I would guess that it might be a good idea to keep the vents away from were the prevailing winds blow. Last year when storm eunice hit where we live we had 55 mph wind gusts. I checked the ducting and I couldn't find any leak. This is based on my very limited experience so I might be wrong.

After reading the instruction manual again, I don't think the above can be achieved. The problem we had last winter was that the Compact P on it's own can't heat the house by itself. According to the manual "In the winter, the built-in heat pump can heat the supply air up to 34 ° C, and thus contribute to heating the home. When the supply air is heated, at the same time a little heat is deposited in the hot water tank and ensures a constant high hot water temperature." When setting the temperature in the termostat to 21C, the program would allow the temperature to go down to 16C before kicking in the electric heaters. So the only way to force the heaters on was to set the temperature to 26C or something silly like that. I'll try to ring the assistance to see if that behaviour can be corrected but last time I spoke with them they said it's "normal" and I did the right thing by forcing them on manually. Edit: It seems that the two functionalities I'm interested in are the smart grid functionality available with the CTS 700 https://www.manualslib.com/manual/2066873/Nilan-Cts700-Touch.html?page=35 and the external heat supply (which I can't find in the control unit) https://www.en.nilan.dk/Files/Files/Engelsk/Downloads/3. Installation instructions/2021-09 M24 Compact P AIR9 GB.pdf

Hi, I've bought an home with a Nilan MVHR Compact P AIR it last year. Since then I managed to understand a lot about how the system works (and the errors that were made by the previous owners). I'm looking for opinions and suggestion, I need a sounding board. First year of use: Nilan MVHR Compact P AIR - with CTS 602 control unit. External heating is provided by solar gains and electric wall mounted heaters. Property is a 4 bed + study detached (about 130sqm) Energy consumed 3600 kWh Energy exported 1600 kWh (small 2kWh south facing PV installation) Standard variable energy tariff (no other tariffs where avaible at the time) I've just had a SMETS 2 Smart meter installed - Landis & Gyr E470 type 5533 From the EPC Feature Description Rating Walls Average thermal transmittance 0.12 W/m²K Roof Average thermal transmittance 0.11 W/m²K Floor Average thermal transmittance 0.12 W/m²K Windows Triple glazing Air tightness Air permeability 1.1 m³/h.m² (as tested) The primary energy use for this property per year is 27 kilowatt hours per square metre (kWh/m2) At the moment I've set the system to run 24/7 at the lowest speed (unless there is a need to cool/heat the house or provide hot water, then the programming kicks in). The tank is 150lt I believe. The water temp is set to 60C, with 25C being the point at which the electric immersion heater kicks in. in the 25C to 60C range hot water is created by the heat pump. The highest threshold point is 80C. Water is only heated above 60C when the cooling functionality is required (I believe). I'd like to switch to a Octopus Agile tariff (I don't own an electric car yet) so I need to be able to tell the system to not replenish the hot water during certain times of the day (mostly between 4-7PM). My plan is to use cheap energy to heat the water to an High temperature and then use the MVHR to distribute the heat from the tank through the house, and to boost the house temperature with the wall mounted heaters when necessary. Unfortunately the details of the programming for the heating functions aren't available from the CTS 602, I can't control the thresholds etc. Any help and any suggestion is greatly appreciated. This is our first home the learning curve gas been a bit steep but I've enjoyed the challenge since I work in IT QA. Cheers