No1 who regulary works on the Greenstar range of WB can say they are the best, the are ****e now (like most boilers), they are a nightmare to work on and take apart, also the plastic manifolds end up with pin holes in them time and again, plate heat ex is a fooking joke 2 get out, safety criticals seals that need changing every time you clean it, they may be easy to fit but so are all boilers its not hard to hang a box on a wall and connect pipes 2 it, but it is important when something breaks down and they all will, it is made as simplistic as poss to take apart and repair WB are not, personally i find Vaillant Eco Tecs the most reliable but thats just me, and they break down 2