Meanwhile, Steve has what he has, for the moment at any rate. He could shut off say 8 rads as a test and see if his boiler/circ pump can supply these, the boiler should cycle then as probably doesn't modulate, he has a thermal gun to check the boiler flow and return temperatures.
This thread is a continuation of the one "really old install - should I change things" and his system has two circ pumps, CH & HW?, can't identify the one shown (from that thread) as a "Grundfos UPS 15-60 130" whatever that is, I thought that the UPS were UPS2, UPS3 etc and UPS without a number is a single speed pump?, its also supposed to be only a few years old. Hope its not a secondary circ pump with less than a meter head.
This thread is a continuation of the one "really old install - should I change things" and his system has two circ pumps, CH & HW?, can't identify the one shown (from that thread) as a "Grundfos UPS 15-60 130" whatever that is, I thought that the UPS were UPS2, UPS3 etc and UPS without a number is a single speed pump?, its also supposed to be only a few years old. Hope its not a secondary circ pump with less than a meter head.