@meraydin 

I use the Tapo infrastructure as my intelligent central heating controller. I use a 9 kw boiler controlled by a S210 on 12v, central heating pump (P110 on 240v) with motorised valves (s220 on 12v) to manage the hot water and radiator flow with 3 different temperature sensors (T310 stuck to tank and t315 upstairs and downstairs) to control different zones with Kasa ke100 valves with door sensors in high traffic areas.

You have to get fairly inventive with the rules, but it works really well. I've done this on four sites now. 2 in houses, one in a lorry and one on a boat.

i tried to use the T310 to control a hot tub, but I couldn't find a way to accurately measure the temperature (it needs a remote waterproof sensor) so ended up using a cheap Chinese thermostat and I just use the Tapo stuff as a safety when the thermostat beaks down.

Overall, for what you are describing, Tapo stuff works really well.