Thanks bud.
Do I need to follow any guide on how to connect the sonoff to the Internet or?
I have never used Sonof before but what I understand is that you need to flash them with a custom firmware in order to use them with Home Assistant.
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Hi @sparkydave @BertrumUK I have received all the parts and need to attach the sensor to the heater.
I have bought 2 sensors i.e. the AM2301 and DS18B20.
I opened up the immersion heater to see where I could attach the sensor. The photo’s below are a close up view of the heater. I need your advice as to where I fit the sensor (place with a red arrow or blue arrow on the photo) and which one?
Many thanks.
I would use the DS18B20 only. Not sure about the safety of placing where the blue arrow is as that is the heater so would try the red and see what readings you get. Usual H&S rules apply and you do this at your own risk.
Hmm thanks.
Can you please tell me what are your safety concerns if was to place where the blue arrow is?
You are working very near to electricity. I’m just advising caution as I would with anyone doing the same as you.
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The issue with putting it near the blue arrow is more a case of getting an incorrect reading of water temp. Really both locations are too close to the element but you can use a template sensor to offset the readings to account for this i guess. I would keep it away from the element simply to try and get a more accurate reading of water temp rather than element temp. Electrically, the unit is sealed (other than the terminals for the wires) so safety “shouldnt” be an issue (disclaimer: I’m not responsible for fingers going where they shouldnt!) 
so are you saying to insert the temperature sensor in the water in the tank rather than the element?
no, just try not to have it too close to the element as that is likely to be hotter than the water and therefore not give an accurate indication of the water temp, but like i said you can program in an offset to counter that
Hmm fair enough. . Where do you think I should put it then? And also can you please provide me with the offset to counter the inaccurate readings?
Thanks
well you could put it in the tank as you previously mentioned as long as you have a way of doing this while keeping it all water tight. The best way to do that would be to use a thermowell. As for the offset, you will need to do this by looking at the temperature you get back from the sensor vs the actual temperature of the water, then create a template sensor.
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So I got everything setup with sonoff th16 and the temp probe.
I have put the temp probe near the heater it’s doing well in terms of measuring the heat. However I find that whenever I open and close the room where my heater is because of the sonoff temp sensitivity I get temperature drops.
The temp probe is covered inside the immersion heater i.e. in the white plastic…
Any solutions to this issue?
that sounds normal if opening the door is letting heat out of the room…
I need to put the sensor in a better position I think… the readings are not great
Hello guys @BertrumUK @sparkydave @GadgetUK
Just wanted to borrow your minds on replacing the sonoff th16 with a shelly 1pm?
What do you guys think? I know I will be losing out on temperature monitoring but that’s fine.
I hear shelly products are much safer. However they need to be inside a box? Is that true? Can I not just connect the mains and leave it?
Mind you I need 16Amp and shelly 1pm states it can work up to 16Amp? Is that sound?
Hello, I have no experience of the Shelly devices so cannot give my opinion. I would look around to see if anyone else has used one for the purpose you are suggesting.
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I came across a product the other day that replaces the thermostat on the immersion for a smart thermostat. It looks like it is an 11 inch size, unfortunately my immersion has a 7inch thermostat.
Looking through their video it looks like it runs esp which would be really nice
The model number (EST-100) also show this site which I think is the white label company
https://www.euroicc.com/product/est-100-smart-thermostat/
I’ve been looking out for something like this for a while because i’m stuck with Eco 7 timer. I hope this is of use to someone
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that looks really nice. thanks for sharing
No problem. I’m hoping that I can use this somehow. It might be a case that I have to buy the whole immersion unit to use the bigger thermostat.