Best 35kw combi boiler?

Hi there, it's pretty subjective as there's not much between them in terms of flow rates, warranty, reliability but you can't go wrong with a Vaillant or Worcester. If you're fitting new heating take the opportunity to install a smart thermostat for improved control of your system. I am a registered installer for Tado, my preferred system. If you want any more information have a look on their site or message me. Best of luck, Rob

Everyone has their favourites mines the Baxi brand which includes Potterton and Main boilers. Bear in mind you need a good incoming water supply to benefit from installing a 35 Kw combi. Also gas supply has to be adequately sized.