That is a fantastic price. £40 odd pounds just a few years ago. Did you feed all taps or just the shower?{I have fitted one of these in the feed pipe work,to the last 3 new caravans we have bought using 3 adaptors, 1/2” BSP to 12 mm John Guest fittings.The shower tap is then left in the Hot position. You will also need Y adaptor to cut into the existing Cold feed to Shower wash basin pipehttps://www.ebay.co.uk/itm/186821663114
I like the idea, what happens when you run out of hot water for the shower, does it just close off the supply, or does it just feed the cold side.I fed the washbasin and shower and set it to a comfortable washing temperature. Left the sink at hotter temperature. It’s located underneath the washbasin.Did present caravan new in 2023 the day I drove it home from the dealers as I had got all the parts ordered,. Had done two of our previous caravans the same so well proven. The wash basin and shower leave tap in hot position and just use it on and off.