22

I think it’s an American invader that’s decimating our English native version of the same species.

https://www.buglife.org.uk/sites/default/files/pictures/White-clawed%20crayfish%20(Austropotamobius%20pallipes)%20(c)%20Mike%20Drew.jpg

23

freshwater crustaceans resembling small lobsters (to which they are related)

from: Crayfish - Wikipedia

24

More about the native English one:

25

anyways i’m off, left an email for unoeuro (hosting company) if they offer either nodeRED or mqtt or both

i assume that those 2 parts are not part of emoncms unless i go for the pi image

26
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27

figured how to calculate the time to heat

Pt = (4.2 × L × T ) ÷ 3600
K is liters
T is temp difference

the result is devidede by the kw number from @Robert.Wall

Power (kW) = Flow Rate (l/s) × Temp.Rise (°C) × 4.2

of course this assumes that everything is 100% efficient and there is no heat loss

so i would add say 10% at least to be sure

and it seems that my hosting company is closed for the weekend and maybe also for summer hols, but at least i have found a few free MQTT servers i can use, then i only miss node red

reason i want to go with hosted is that its cheap enough for me, and i can maybe get by with an esp module at the pool end