What is the life expectancy of the solar pump and does it come with a guarantee?
Intended design life of the whole solar water heating system is 20 year minimum. The performance warranty is 5 years, although some products, such as the polycarbonate glazing actually come to us with 10 years warranty. I would expect the solar pump to need replacing before 20 years, however, since it is the only moving part and moving parts are the most subject to wear. We are using an relatively expensive but deliberately reliable pump. The motor in it is a brushless DC motor. Using a brushless, rather than a brushed motor reduces wear and increases life several fold.
