Testing the Webasto Thermo Top C Pool Water Heater full

Webasto Thermo Top C taken from a Citroen C8 which is the same as a Fiat Ulysee II and a Peugeot 807. Simple 3 wire control, looks more complicated than it is because I'm using relays as per the workshop manual.
I've since added a cheap £3.85 digital thermostat from eBay hich has worked wonders all year - • Video