This is the story of the creation the Bosch Tronic Heat thermostat:
We installed a Bosch Tronic Heat 3500 electric heater. After it was successfully installed we faced the following problem:
- in pump in the unit was working continuously which is required so it can measure the current water temperature
- unfortunately this keeps all the piping on the same temperature as the fluid itself
- no matter how hard we tried to insulate the them it will always ‘leak’ a bit so we lose energy in the basement
- the solution could be that the pump only works when the tank really need to be warmed up
- our current thermostat controls that part of the heating system which pulls the water from the tank into the heating pipes in the building so we cannot use that
- reading articles on the internet we came to a conclusion that we need a thermostat for the heater itself
- we did not find anythings in the local shops or on the net or we were not really impressed with their price and service pairing, so we created one
- the signal circle is a simple 24DC ‘short-circuit’ on the heater side
- we put the sensor on the puffer tank exist connector which goes to the heater and covered it with some thin foil and some stone-wool
- sensor showed us exactly the same values as on the physical gauges mounted on the side of the tank so we think it was positioned and insulated correctly.
The implementation is not complicated and the used components are widely available.
The total assembly can be done in 4 hours.
The completed unit images can be found the gallery below.
Arduino source code: github-link
Links:
This was the story of the creation of Bosch Tronic Heat thermostat.
