How did you get the update? Just rang Grant and asked?
Actually emailed them, and they set up a service visit. Apparently some units having no water pump control is a known issue (early models apparently?). You do have to persist past first level support folks though. Rhys told me that not all service techs have the (chinese!) reprogrammer so may be a lottery. The default water pump params show up on the econet system (30, 50, 100) after the update, prior to that they read as 0,0,0 and changing them had no effect anyway, but there was actually a 50% PWM minimum, though you couldnt see that.
The update also seems to have fixed oil recovery to be every 4 hours, as per the manual, instead of the 3 hours i was seeing.
Might send them an email over. My oil recovery is every 3 hours it seems. Did you have to give them a reason other than simply you want an upgrade? 
maybe you said needed more control over pump speeds or whatnot?
I told them it was not doing what it said on the tin .. water pump too noisy, and not modulating, dt too low, oil recovery too often, needed fw upgrade as seen in this very group.
No pushback, very helpful, but first line tech support know less about the things than we do, you need to get to service folks. Took 2 weeks to get engineer out, which is fine, not a priority fix.
Hi folks,
Curious what the 9kw would use power wise while doing the hot water cycle?
Thanks
Mike
You can have a look on heatpumpmonitor to get all that data, here is a link to all the R290’s.
It will change drastically based on setup and how you run it:
- Your cylinder coil size
- Running in silent mode or not
- Your target DHW temp
- The outside temp
I run mine to 43c cylinder temp:
- On a cold winters day I cannot use silent mode so it uses ~ 3.2kw to 4.2kw
- On days like yesterday it’s on silent mode 2 and uses ~ 0.9kw - 1.6kw
When running silent mode my cylinder can take up to 1 - 2 hours to heat, when running normal mode it’s probably up to an hour. Far less efficient. I’ve had recent runs of COP 4.22 on a normal cylinder when doing DHW which when you consider that intelligent octopus go is now a bonkers 3.5p/kwh that’s 0.82p/kwh for dhw heating which is just nuts I find, considering gas would probably ultimately be around 7.2p/kwh (ish) when factoring in efficiency.
Thanks so worst case scenario 4.2kwh for one hour during cold periods? I’m in Dublin and currently on 3 hour cheap tariff where I’m charging house batteries and car and only have a 12kwh connection at the moment. I can go to 16kwh for about 1800 pounds or 20kva for 3600 (ground works required etc) would like the 20kva but if I could live with 16kva would obviously be cheaper. At the moment while charging the house batteries I’m only getting about 9kwh into the car which is a bit tight. If id enough bandwidth could put 21 into the car
looks like we might be getting the grant installed in the coming weeks. Anything to keep an eye out for during the install? Best to ask latest firmware etc is in place?
@glyn.hudson can i ask where you sourced your grey isolator? i see them on midsummer but they dont seem to want to ship
I got mine from midsummer, I can see they currently have 147 PCS in stock:
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thanks they just wouldnt post to Northern Ireland or Dublin so I’ve used a postal forwarding service..
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Are you doing an update youtube video soon Glynn? Our r290 is coming next week apparently… excited nervous.. one new rad downstairs and swapping a rad from a bedroom to bathroom k2 and new k3 in bedroom.. base dug out yesterday for the heatpump
I intended to wait a full 12 months, which will be in July. But there’s not much to say really, other than it’s performed excellently. Here’s the live data: https://heatpumpmonitor.org/dashboard?id=748
Averaged a COP of 4.7 for space heating and 4.2 for DHW. Which make it less than half the running cost of oil, before the price increase in oil!
The house has been super comfortable, we keep it 20C-21C 24/7. The heat loss has been slightly higher than I estimated, bit this is because I’m in the process of upgrading the loft insulation. Half the house currently has no loft insulation, since I’m doing other renovation work and installing MVHR. Next year should see a significant energy reduction with 300mm of loft new loft insulation and MVHR 
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thanks - would there be anything i need to ‘watch’ for in terms of settings during the install?
I can’t think of anything specific. Are you installing monitoring? I’m obviously biased, but OpenEnergyMonitor monitoring data is very useful to optimise the control settings.
im adding an energy monitor on the power supply to the pump but not open energy - dont think id have it in time or perhaps budget for it.. out of curiousity what would i need to order for open energy?
The onboard Grant monitoring is very poor, the displayed onboard COP is totally incorrect.
As a minimum, I would install a heat meter, since it’s easy to install when the pipework is being installed but difficult to retrofit afterwards. We have plenty in stock and can ship next day pre 1pm delivery:
Here’s our full L3 monitoring bundle which includes web-connected base-station and electric meter:
the heat meter and my own electricity ct clamp meters would give me all i need?
It won’t be MID approved, if you don’t use a MID electric meter. But CTs are usually reasonably accurate. You will be able to read the heat meter manually and divide the figure by your electric meter. If you want to data log and graph data from the heat meter you will need the L3 bundle or DIY your own MBUs reader.
I could ask my installer if he’d put it in..are there differences in UK versus Ireland fitting sizes? I’ve ethernet at the hotpress is that where the heat monitor goes? I guess shipping to Ireland is liable for import duty? Next day delivery to northern Ireland?