New KCP-4 Solar Water Heater Controller | Kaichang

The New KCP-4 is a dedicated solar controller for non‑pressurized solar water heaters. It supports both automatic and manual water supply, with additional options for timed refills and temperature‑triggered filling. The unit displays current water temperature and level simultaneously, with five level indicators (20% blinking indicates low water). Overflow protection and high‑temperature protection enhance operational safety, while a water‑full alarm alerts users when the tank reaches capacity.

For cold‑weather protection, the controller offers both automatic and manual drain‑back functions. The system includes three valves: a white DC12V inlet valve for mains water supply, an orange DC12V lower drain valve for water release during drain‑back, and an orange DC12V upper three‑way valve for collector inlet/outlet switching. Users can adjust the automatic drain‑back activation temperature (default 2°C) and select between pipe modes to suit their installation. The unit also features a forced water supply function for emergency refills.

This solar water heater controller provides constant‑temperature control via a liquid expansion thermostat with a 0‑99°C range. For enhanced freeze protection in colder regions, it can be paired with an anti‑freeze solar pipe valve. For whole‑home hot water convenience, integration with a whole house hot water recirculation system is also supported. In hybrid solar‑gas installations, a solar gas automatic switching sensor enables smooth source transitions. Kaichang offers this unit with a 250V, 10A power rating. Follow the provided manual for correct wiring and parameter configuration.