MikeSharp01

We used Norrsken and had the same basic worries so we split the contract so that no single part was above the 30K limit on the Credit card protection which made me feel better. As with Nick they did a grand job and came back promptly to fix an issue with one of the seals jumping out of its slot.

Today's learning point is this. The heat meter arrived yesterday and very smart the OpenEnergyMonitor.org Level 3 system is! However pasted across the flowmeter port is a sticker that says '1.5bar minimum pressure' which gave me cause for concern because our system only has a 9m head pump and in normal operation we will be using only 2.7m of that at 5oC delta T (5.57m at 3oC delta T) which is only about .25bar. So I called the suppliers and asked how this would work and got a simple, but not obvious to me, answer that you need to pressurise the system first. Reflecting on this news I think I get why the system might need a base load pressure. To ensure positive flow to each circuit giving the pump a stable operating point. Stop cavitation in the pump Remove the possibility of negative pressure sucking air into the the system. If that make sense the only question now is what pressure to set it at? 1.5, 3 bar or some other value?

Bending 28mm pipe sounds like a challenge, I got the swept bends in the images to avoid bending myself. I do have a conduit bending machine but I am not sure I can get a 28mm former for it - I will have a look.

Yes John and I realise I could simplify further as this image:

Just plumbing in the heat pump and am trying to keep all pressure drops to a minimum. Here are two possible configurations of one part, assume the plastic segment will be copper, which of them is going to have the lowest pressure drop I wonder and how would I work it out? It is all 28mm pipe.

Yes but there are 35 million cars registered in the UK!

You do wonder a little tiny bit why not - as it would encourage people to move away from gas and towards electricity. The downsides are relatively unthinkable and the elephant in the room problem is that we don't have enough electricity to move to and too much of what we do have is made by burning gas.

Phew - we got our approval through 3 weeks back via the Cool energy umbrella scheme and I hope they will allow that through! The HP has arrived as has the tank ( from Telford - via Trevor at cylinders to go) but it won't be commissioned for 6-8 weeks.

MBC is very well regarded in the timber frame space and they are national.

No buffer just three loops in parallel as one zone.

The heat pump from Cool arrived this morning so now comes the interesting bit!

Yes got to order one of these Level 3 kits but so many options - will need a phone call to them I think.

I think the attached spreadsheet document, from Cool Energy, might help but have not looked carefully. Its the BMS Modbus link.(Unit Information and AI tabs). R290 heat pump X1.HL092H.K05.001-1.MODBUS_RTU.V100A07 - 2025-4-16.xlsx

Makes sense @Big Jimbo thanks.

See pics. Our boy has given me the job of fitting their vanity unit. Getting there is a mission but I have hit the problem of fitting the basin to the cabinet. There are no fixing points on either without some form of fixing the sink slides about! How is the connection made in these circumstances I ask myself and so the team here. Silicone? Mirror pads? Velcro pads?