Temperature of hot water

Gumbo wrote: »

I’ve been chasing this myself as I have an eddi.
Sometimes during winter, not a lot gets diverted but enough to heat for a shower.

I’ve resorted to manual method of putting my hand on the top pipe that leaves the cylinder. That pipe is directly touching the water in the cylinder, so if that’s hot, inside is scalding. If that’s warm, inside is hot etc

Think of it like a spoon in a cup of boiling water. Think of how the spoon heats up.

Sorry for bumping an old thread just wondering have many fitted the relay board and thermostat sensor to their Eddi?

Recently replaced the old small cylinder to a new Joule Cyclone and would like to get accurate temperature information.

Thanks for the reply. Do you find it was a good addition to the setup? Board and probe are relatively cheap so thinking it could be useful for automation.

My use case would be to know if the water is hot enough the next morning to have a shower or do I need to boost via the Eddi or Gas. At the moment its a bit more manual by running the hot tap to check.

What solar thermal controller to you have @Jonathan? I have a Kingspan SC400 that also shows me top cylinder temp, bottom cylinder temp and roof collector temp. Would love to get that info into home assistant

If all else fails, you could look into tapping the voltage levels of the PT1000s at the terminals using an ESP32's ADC or similar & report values over WiFi.

You would just have to calibrate the readings once against the water temp in the tank or if you could check how the resistor divider is laid out on the existing PCB you could be more confident of the values.....

However, you would want to be sure of what you were doing. I suspect the warranty is long gone.😁

Hello there! I too have an sc400 and would love to be able to push this info into Home Assistant.

Have you had any luck in doing this yourself? Many thanks!