2 layers

HotWaterRecirculatingPump
NilsRo/HotWaterRecirculatingPump
Automation of hot water recirculation pump via ESP32
12 parts5AGPL-3.0
KiCad boards from 2 GitHub repositories tagged “hotwater”, the most starred first; open any of them in PCBKit.

NilsRo/HotWaterRecirculatingPump
Automation of hot water recirculation pump via ESP32

mlauke/smartswitch
sonnen battery controller based on ESP8266/ESP32 to drive a 3.3kW heater (Heißwasserspeicher-Einbauheizung) and integrates with the local hot water system.