Hi its Alan Wright here and I have just joined the forum. I invented the ShowerPower Booster in 2010 and we have been selling them since 2014. They score 5 stars on Trustpilot and are very reliable. I have spoken to customers all over the world where these are fitted to boost beer taps (Poland), Water supply from a river to a childrens home (Angola), cold drinks coolers (Caribbean), solar thermal (Mumbia - India), rainwater systems (Australia). They fit into an existing pipe system and in a power cut they will default to 100% bypass.