kero is 28 second, and the above fella is correct 35 second for cherry,, as i said erlier DONT PUT CHERRY IN YOUR HEATING TANK,,
THE OTHER THING is if your a tennant, the landlord is responcible for the maintance of the boiler,, ours is checked yearly to comply with safety regs.
now if you feck it up with cherry ,, who do you think will pay for a new one,,,,, your landlord?????????????
get your hand in that swiss acount and draw out £250 by the way some companys insist on cash up front.... however some will send you an invoise a couple of weeks after the delivery ,,,, so