I am a plumbers mate and need to replace and fit a new boiler in my place without going any where near the gas of course as i know that this is illegal,my mate says get the boiler onto wall ,connect flow return ,cold feed,hw out,but DO NOT GO ANY WHERE NEAR THE GAS INPUT,if he connects the gas ,& commissions the boiler after I have fixed boiler to wall &connected a few pipes which I know I can do with ease,just a Sunday mornings stroll for me no problem,will the manufacturer of the boiler (most likely Valiant uphold their guarantee for me ? as it will have been gas safe reg installed and commissioned by a time served Gas safe registered central heating engineer.