misolarcasero.com
If you want to know about differential thermostats, what they are, and what they are used for, take a look at this another page of mine: Differential thermostat
The differential thermostat is strictly necessary in a solar heating unit.
Obviously it will not be necessary in a thermosiphon type solar heater.
The differential thermostat is what manages the pump according to the data received by the temperature probes.
So there is not much need to instruct too much about its installation, especially when there is already documentation on the subject in the thermostat section.
Here I indicate the order of connections required by the differential thermostat:
The graphical representation of the parts that connect to the solar thermostat:
I have a side project to this one, which deals with differential thermostats, which can be used with any solar heater and are far superior to the commercial devices you can find on the market.
These differential thermostats are built with arduino or esp32 controllers.
Versions built with arduino are released for free download and self-build for anyone interested:
My differential thermostat web page
And if you want to take a look at this differential thermostat model that you can build yourself, you can download the manual on how it works:
enthusiast with two decades of experience using this operating system, which has enriched my approach to development and technical problem solving. 
and 
, with approximately three years of experience in 
, in addition to having a good foundation in , and 
and 
, combining my skills with a deep passion for technology. 
environments, which I use in all my programming projects. 
