Do you have a sunny place to install the solar hot water heater?
You will need about 5 square meters of roof space, through the south to the east, and the main part of the direct sunlight a day.
The solar water has not been installed on the roof, they can be fixed to a frame on a flat roof or hanging from the wall.
You have a large enough space, or an additional hot water cylinder?
If you have not yet installed a dedicated solar cylinder, then you will usually need to replace the existing cylinder, or add a dedicated cylinder with a solar heating coil.
Your current boiler and solar water heaters are compatible?
The most traditional solar hot water boiler and hot water cylinder systems are compatible. However, if your boiler is a combination boiler, you currently do not have a hot water tank, solar hot water systems may not be compatible.
Recognized by a competent installer will be able to assess your home and help you choose the best settings to meet your needs.