Heat Pumps - post here.

Morning all.

Heat pump currently being fitted, just waiting on electrician to complete.

In the meantime does anyone know if the Edi meets this requirement? would rather not have to fit a separate immermat timer.

Thanks

maybe, I'll get a simple timer should we ever have an inspection.

Hi All

Any good recommendations/resources where I could workout how to go about calculating the heatloss of my house?

Cheers

Not in relation to BER but to the SEAI Domestic Technical Standards and Specifications (DTSS) which, I assume, are what will be followed should an inspection take place.

Like you, I am of the opinion the an Eddi qualifies as a timer and can be clearly shown to be.

Here you go - heatpunk.co.uk

https://heatpunk.co.uk

Any special reason why you're both going with Vaillant?

+1 on what Championc posted. I wouldn’t be arguing they are superior to any other manufacturer, but I just think the amount of info out there makes them particularly attractive from a DIY point of view. Both Heat Geek and Urban Plumber have installed plenty of them including in their own homes.

Glyn Hudson, one of the founders of Open Energy Monitor has DIY fitted one in his parents house and has posted a couple of videos on his YT channel https://www.youtube.com/@GlynHudson/videos. His latest video reviews how it has performed since it was installed last year. As well as topping the performance charts and being the most popular HP (24 out of 70) up on https://heatpumpmoniyltor.org, the majority of the Heat Geek fitted HPs up there are Vaillant.

Another good point Glyn makes is the importance of a door blower test when carrying out your heat loss calculations as if he had used the suggested air changes (ACH) values then his calculated heat loss would have been much higher resulting in selecting an oversized HP.

Do you or anyone have a link or specific Shelly EM to buy?

Has anyone on here ever had an issue with high usage on their Panasonic heat pump? I had an issue where by the auxiliary element would kick in one day a week to increase the temperature to protect against legionella. However the element is only suppose to kick in for an hour or so. There's a fault in mine however and the element doesn't recognise when the temperature has increased sufficiently.

This has resulted in the element failing from over use which is very rare. The element itself is quite expensive to replace. I'm just wondering if anyone has had a similar experience?

I have since put in a new element and turned off the function for legionella as it was happening again. This had been happening unknown to me for over a year and obviously increased my bill as a result.

HP chart

jesus i feel like im doing something wrong at that rate! how is your usage so low the last few days?

Sorry to derail a small bit but what devices are you using with HA to log the data from the pump? Id be interested to do something similar on an existing HA setup

What temp are you heating house to? Oh I see its gshp, that will be factor in lower usage then cyrus.

I'm waiting to see data from smart meter on esb but last few nights i have been running 30deg flow from midnight to 10am mostly night rate 18c and house is still 21/22 come 7/8pm. Kitchen gets up to 23 with running that long, nice for herself working from but maybe not necessary. I'm expecting approx 18-24kwh. Have individual meter for heat pump but forgot to take note last night what it was at.

I've changed my heating strategy in the last 2 months since I moved to a new smart meter tariff, so I have been looking at my HP consumption closely recently. As you can see, the difference between 2023 and this year is stark, but I put this down to the very mild weather heating only coming a week or two ago!!.

Up to now, I have just been letting the HP call for heat and hot water as it needs it, so every time I had a shower, it would come on and top it up. If one room needs heat, the HP would come on and heat that room and only that room. I'm in a new build; it's an A1 house with underfloor heating upstairs and downstairs, and I have 12 zones!

I am lucky also that I have a 300-liter buffer tank, so I have plenty of hot water storage, so I delay heating the hot water to 2 am and shut it off at 8 am. I give it another boost at 2 pm when hopefully, there will be Solar PV, but then nothing until 2 am where it heats at 6.33 cents/kWh.

I have now started in the past 2 weeks is timing the heating to come on at 03:30 am until 5 am and set all the temp stats to a high value, so in effect, I have one zone. My thoughts are to use the thermal mass of the house to retain the heat, and if the HP is on, it may as well be on for the whole house, not just one room. From looking at The Heat Geek guy, it seems this is the most efficient way to do it anyway.

It seems to be working away great; the house temps are steady, and no one is complaining. Now with the weather in the low digits, I have timed the whole house to come on at 7 pm for an hour or two, just to give it another top-up for the evening. Again, artificially setting all the stats to a high enough temp, they all come on. 

Ill keep ye posted on how I get on all winter

Yep changed to similar strategy last winter, the on off method is not efficient, hp goes to effort to heat ufh water for 1 room, Cools down, another room calls and has to start all over again.

It wouldn't come on at 22/23 anyway but i have it programmed the 1 stat i use that during 10am to midnight period it wont come on.

Turn off all other stats or turn them really low like 12 and just have the 1 stat you want to use high up enough it will call and with actuator heads off at manifold, flow will go to all zones. Bit awkward with a basic stat as you will have to switich it lower temp to turn it off but with programmable stat you can add in timed periods where you set it high so will call and other timed periods set it to like 17 so wont call.

Hi,

House was built in 2019-21, so high spec insulation. The heatpump gives a COP of 6 most of the year - less in summer as its only hot water. Room temps downstairs generally 21c.

Vaillant AroTherm 5kW - 22kWh yesterday and a COP of 3.20 - very happy with that

Mitsubishi Srk 50 zs-wf air to air heat pump. 3 story, 1400 sq ft. Heat pump is on the ground floor, really have to ramp up the temperature at the moment to get the heat upstairs. Will be fitting another unit upstairs soon. Upstairs temps, 20.5. Downstairs 22.5.

Yes just highlighting as some people jump to conclusions and think they are using way too much compared to another poster, lot of factors to consider so would probably be best if specified what you are heating and to what temp when posting figures.