If you’re just looking for some basic remote on/off functionality for your heating and hot water, with built in timers, not dependent on any cloud service or ap

If you’re just looking for some basic remote on/off functionality for your heating and hot water, with built in timers, not dependent on any cloud service or app, may I wholeheartedly recommend Shelly relay products. Simple web interface and easy to physically wire up. MQTT if you need to wire them up to HA or Graphite ( power meter varieties) or whatever.