50l white non pressure vacuum ...

In summer, it may be possible toheat all the water you need with solarenergy. In winter, or on cold cloudydays, solar water heating will meet partof your hot water needs – you’ll alsoneed some supplementary heatingfrom your booster system.The exact amount you save from solarwater heating will depend on a widerange of factors including how muchhot water you use, the solar waterheating system you install, and thequality of the installation.