My central heating has a Baxi back boiler around 28 years old. I want to replace a standard double radiator with a designer radiator like this one http://www.bigbathroomshop.co.uk/He...e_Radiator_1780mm_x_472mm/cid7826pr56712.html. I'm assuming that this radiator will need a lot more hot water flowing through it than the old one. Will the old boiler be up to the job?