I am looking to buy a new boiler for a complete new central heating installation (replacement). Everyone seems to recomend Vaillant but what other makes would people recommend. Worcester, Vokera, Ariston etc.... Vailant seem to be the most expensive but are they worth it? Looking for a natural gas system boiler around 28kw. Also, all webesites list a number of accessories availalbe. I need a horizontal flue kit, and obviously a room stat but do the controls on the boiler not enalbe you to set times for hot water/heating to come on these days, hence do you need to by a separate controller? Also, i have bought a twin coil cylinder with the intention of potentially in the future adding solar heating on the roof. Are most boilers compatible with these systems or is there something specific i should be looking for. I guess this is where a separate controller comes in to turn the boiler on and off when the sensors tell it extra power is needed to the hot water.