Without a doubt, the UK water heating market is going green with renewable options now on offer. One renewable solution is solar thermal water heating, and many manufacturers have recently introduced solar products. Heatrae Sadia launched its unvented Megatech and vented Megalife Solar cylinders last year, and sales figures have been very encouraging. Here, marketing manager David Webster explains the factors driving the solar market and gives specifiers, building managers and installers some advice on what to look out for when choosing a solar thermal cylinder