4.6 Closed Loop Glycol Kitset

To suit 4 person household, requires 280 to 300 litre cylinder c/w coil. Everything you should need kitset including 2 high efficiency 2.8m² collectors, flat to roof collector fixings, ESR21 controller,  pipework, fittings, pump, pressure relief valve and pipe insulation, expansion vessel and 5 litres of propylene glycol.