Hi there putting the OE Monitor onto my 9 yr old GSHP Nibe 1145 , have a built in DHW diverter with seperste cylinder and 4 pipe buffer . My question is do I need 2 HM one for heating out and 1 for DHW primary, as no room to fit 1 HM for all within the HP cabinet , thanks in advance Lloyd
Hi Lloyd. Welcome to the OpenEnergyMonitor community and thanks for posting your question. While NIBE systems aren’t as common as some other brands there are a few of us on here with NIBE installations (both Ground- and Air-Source) and there’s a good understanding of how they operate.
I also have a NIBE F1145 GSHP of a similar vintage and faced the same question. Exactly as you say, the DHW diverter valve is factory-installed within the GSHP cabinet and there’s not a lot of space in there (and it seems a shame to mess with the nicely-insulated factory pipework - plus there could be warranty implications of messing with anything inside the cabinet).
I concluded it was best to fit two heat meters - one on the ‘heating’ pipes and one on the ‘hot water’ pipes, outside the cabinet. While there are clearly cost implications of that, it seems the best way to go. A side-effect is it’s easy to tell if the heat pump is running a ‘heating’ cycle or a ‘hot water’ cycle by comparing the flow rates from the two meters, so the DHW Status Detection Sensor isn’t required.
There are pumps inside the F1145 cabinet which will be included in the electricity meter readings for the main unit. If you have a 4-pipe buffer you presumably have some supplementary pumps ‘downstream’ of the buffer too? You might want to consider a second electricity meter to check how much energy those are consuming.
David
Hi David, and thanks for the prompt response , I figured it would be the case, have space so will order an extra HM, only a Yonos Pico on the distribution, but will also get an extra clamp too , thanks again and looking forward to diving deeper than myuplink
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