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MY GAS BOILER DATA IS LIVE!

Emoncms


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9 Mar
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9 Mar

18 Apr

tomasmcguinness
9 Mar


With some help from Glyn and Trystan, my gas boiler is now being monitored and
logged to emoncms.org 11!

You can view the data at

https://emoncms.org/app/view?name=TomsBoiler&readkey=484aa317fd15cfef28cc3c7a7a2bedd4
89

Interesting to see my boiler’s efficiency is hovering around 92% over the last
few days which is great! It would be great to see it hit 94/95 which is the
theoretical max for a return temp around 35.

As always, I’ve made a video documenting the setup.



Adding my gas boiler to OpenEnergyMon emoncms.org



Happy to dive into more details if anyone is interested!

12



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TrystanLea
9 Mar


Nice work putting this video together @tomasmcguinness it’s a great overview of
the steps involved getting the data into emoncms from home assistant.

For anyone else interested in the boiler monitoring app, this is was a
relatively simple copy of the myheatpump app but with the heat pump bits
stripped out and an extra feed for gas input among a few other UI changes. The
app is available in the latest version of the emoncms Apps module. Source code
available here (within the wider app module):
https://github.com/emoncms/app/tree/master/apps/OpenEnergyMonitor/myboiler 14

2 Replies
2


TrystanLea
1
11 Mar


Interesting looks like the delayed gas reading created a glitch for yesterdays
total, suggesting an efficiency of 99% ! today is lower but you’re also running
the higher flow temp test I guess. Perhaps the gas input energy needs to be
displayed as a step plot on the graph so that you can select a window that
includes the delayed gas reads…




tomasmcguinness
11 Mar


Could this be caused by the call for heat flag being incorrect?

I changed the wiring to my Shelly i3 at lunch time today, so the call for heat
should be accurate going forward.

@Zapaman suggested a pulse counter approach - I need to investigate this as it
might provide faster updates.




TrystanLea
11 Mar


I think it’s just window alignment with when the kWh values are incrementing…

I’ve made a minor change to show the efficiency in the window and fuel kWh
values stepping up, it’s now much easier to manually select to get the right
alignment:



image1012×535 83.5 KB



It’s not showing much of an efficiency loss though with 50C vs 43C… maybe it’s
not enough of a difference… ? interesting stuff!




tomasmcguinness
11 Mar


The return temperature is too low to make any impact at this stage. I suspect
once I pass a 60 flow temp…

Maybe I should just do a week at 60 and a week at 70?



image1024×812 88.5 KB






TrystanLea
11 Mar


tomasmcguinness:

> Maybe I should just do a week at 60 and a week at 70?

Sounds good! what’s the max temp you can run it?




TrystanLea
11 Mar


Chatting to Glyn here, it might be that it will be difficult to assess the
impact during these milder conditions as run times are not long enough to get
the average return temp up?

E.g average return temp when running here was 34.6C, it rises and levels off at
38C…



image1041×958 122 KB



2 Replies



TrystanLea
11 Mar


Is there a digital version of that boiler efficiency chart where you can dial in
the return temp and it spits out the expected efficiency?

If you can find a good algorithmic fit I can try and add it to the boiler app as
an efficiency simulator

2 Replies



TrystanLea
11 Mar


One of your best runs so far:



image1015×893 128 KB



 * 93.8% including electric
 * 96.2% fuel to heat only (not including the 0.359 kWh of electric)
 * return temp average when running: 34.4C

The fuel to heat only in that example is spot on the chart!

Perhaps the efficiency should be reported as two separate figures one with and
one without the electric…




tomasmcguinness
TrystanLea
11 Mar


As I read that, I’m reminded that boilers will try and maintain a 20 dT
(somebody on this forum actually told me that)…

Perhaps I should just jump to a 65 flow, which should see the dT rise to 45,
based on that assertion?

I suspect that efficient chart doesn’t take electricity into account!

2 Replies
1


TrystanLea
11 Mar


DT20 probably just a rule of thumb similar to heatpumps need DT5 I guess…

2 Replies
1


tomasmcguinness
11 Mar


They implied that the boiler’s pump would strive for 20dT, which would explain
why rising the flow to 50 didn’t impact the return temperature?




TrystanLea
11 Mar


Higher flow temp results in hotter radiators and more heat output which will
give higher DT if flow rate has not increased…




tomasmcguinness
11 Mar


Yeah. The flow rate doesn’t appear to have changed at all.

My radiator sensors aren’t quite setup. Battery died in one I think, so the mesh
has failed



image1179×1284 92.8 KB



These show the return temps are north of 40 on the rads that are communicating.
The lack of balance is probably having an impact.

I’ll ramp the boiler up to 55 in the morning all the same




toadhallAlun Hawkins
1
TrystanLea
12 Mar


I configured the My Boiler app (directly on emoncms.org) here

https://emoncms.org/app/view?name=GlowWormBoiler&readkey=88a6c522550d5fd6ffece80a646b4952
5

Set up in the same way as Heat Pump App, Inputs and Feeds showing live values,
but the My Boiler App configuration page does not display a “Launch App” button
in the same way as the Heat Pump App does. Not sure what I have done wrong.

Ok, figured it out. It seems to require the boiler_elec feeds to be populated.
Since this data may not be easily available, seems better to make those fields
optional?

2 Replies



TrystanLea
12 Mar


It needed the boiler electric consumption data (pump, boiler fan etc), I’ve
removed that requirement now. Looks like your getting about 80% from this one so
far?




toadhallAlun Hawkins
12 Mar


Yes, when not condensing it seems to manage 80%-ish, once it has settled down
and is condensing it gets into the 90s. Be interesting to see how it measures
up, it is best part of 16 years old. part of a hybrid set up with a Heat Pump.

1


TrystanLea
12 Mar


Thanks @toadhall interesting comparing with:

assets.publishing.service.gov.uk


IN-SITU_MONITORING_OF_CONDENSING_BOILERS_FINAL_REPORT.PDF 4

4.24 MB






image578×803 91.9 KB



between both of your boilers you have most of the range it seems (other than the
few below 80%)

1 Reply



tomasmcguinness
toadhall
12 Mar


Hey @toadhall, how are you getting such granular fuel data?

2 Replies












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