the person sized one could be used as a heater if adding water cooling loop to it
but i missed an Z, first post corrected 
shit happens when you are getting tired
yes, that is what came to mind, my head does not work as fast when its getting late
but yes, i guess it can do that, but do i need a CT for it? or can i read the watt usage and enter a fixed number?
and can i predict how long it will take to heat the pool to say 30C ?
You’re an hour east of me, and many hours east of Bill. Don’t worry about the missing ‘z’.
Just go and get some more. ZZZzzzz… 
That, forgetting losses, is pure physics. So Wikipedia is where you go. If somebody complains to me that their electric shower isn’t working properly, this is what I use:
Power (kW) = Flow Rate (l/s) × Temp.Rise (°C) × 4.2
Why might you need a c.t? That’s only needed if you’re interested in efficiency.
I’d say that would be extremely difficult, because the losses will depend on the air temperature, wind speed and the surface areas - which will lose heat at different rates depending on whether it’s the water surface, the pool sides or pool bottom. And if the losses equate to the heat input at a temperature less than 30°C, that’s the top temperature you can reach.
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will do, just finished setting up emoncms on the empty web space i have with my hosting company. closed down a small 3d print shop and the server is paid for rest of year.
what i will me thinkering about during the night and tomorrow is the hardware side of things,
something based on this: WiFi MQTT Control Relay Thermostat - Guide | OpenEnergyMonitor (or something self made with the ESP8266, i just need to figure about nodered and mqtt, not sure if the hosting company has those, if so i could live without a pi
or do i not think straight?
Sorry, I know nothing about MQTT and Nodered, so I can’t help you there.
it does not have to be super precise, a cloud could pass in front of the sun and scew up things
you are right, and i would also need an ac adapter (i think) but it could be fun to see how well it works. if anything i could add it last on the build list
you are right, so far we only have a black cover on top of it, i do plan to get a solar blanket for it which is just bubble wrap cut in a big circle shape
and if all goes to plan next summer we should be house owners and then the pool will be on a raised platform so it can be insulated on the sides and under it, more planning for that during the winter
but if that happens would it help things if i add sensors at the sides and bottom, under the insulation and on the outside of the insulation?
anyways i think its time for a lot of that ZZZzzzz… 
Just givin’ ya a friendly ribbing about it, Bo. 
Bonus points if you know what the item in the first picture is and who is standing beside it.
More if you know what the animal in the second picture is. 
Is that Robin Williams next to that Cray-1?
cray super computer and Seymour Cray next to it
Yep. The animal in the next pic?
crayfish?
tempted to say lobster, but do not quite fit with how i remember a lobster, seems to small to be a lobster as i remember it
Crayfish. You’re right about the looks though. They do indeed look like a miniature Lobster.
I think it’s an American invader that’s decimating our English native version of the same species.
freshwater crustaceans resembling small lobsters (to which they are related)
from: Crayfish - Wikipedia
More about the native English one:
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
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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