I have a 21 Year CH system. It has a potterton Netaheat Boiler MK2 10-16. Although the boiler runs I find r=that the rad although Pipeing hot do not sufficiently warm the house even though I have insualted the house well. It appears comparing the Rad outputs by way of feel to modern rads they seem not to convect warm aiir as much as the newer rads around these days. Does anyone have an idea if changing Rads and keeping the Boiler will improve the situation? Many thanks