Solar Water Heating System Application

With more than 10 years of R&D and production experience in miniature DC water pumps, Dongguan Haimi is a professional manufacturer specializing in customized circulating pump solutions for residential and commercial solar water heating system, which has become a core supporting component for household rooftop solar hot water projects and centralized solar heating engineering worldwide.

Circulation is the core of solar hot water equipment: solar collectors absorb solar energy and heat the circulating medium, and qualified solar dedicated pumps drive hot liquid to flow between heat collector and insulated water tank continuously. Our flagship model HM6002-1 three-phase solar DC water pump is developed specifically for this working condition, with operating voltage ranging from 12VDC to 48VDC to directly match the power output of solar panels, realizing off-grid operation without alternating current power supply. Different from ordinary mains-driven water pumps, our solar circulation pump can work stably under fluctuating voltage generated by sunlight changes, greatly improving the whole-system energy efficiency of solar water heaters.

Most outdoor solar heating equipment is exposed to variable ambient temperature and rainwater erosion. Haimi solar pump features IP68 full waterproof rating, applicable for fluid medium temperature up to 75℃, and resistant to weak acid & weak alkaline liquid within PH5~PH10, perfectly adapting to all-weather outdoor installation environment of rooftop solar projects. Equipped with built-in multi-protection including dry-run protection, overvoltage and overcurrent protection, the pump’s continuous service life exceeds 20000 running hours under standard working conditions, cutting later maintenance cost for solar engineering installers and end users.

For high-rise building centralized solar heating projects that need pipeline pressure boosting, our DC water pump series works as a matched booster unit to solve insufficient pipeline water head problem of long-distance hot water circulation. When the project needs auxiliary water tank oxygenation and water quality circulation, customers can match our supporting diaphragm pump to realize dual functions of hot water circulation and water body maintenance in one whole set of solar heating system.