Hi All, My Grudnfos UPS18-60 Modlel A heating/hot water circulation pump has failed (just before the cold weather to turn in !)can I replace it with a Wilco Smart Pump ? as they are half the price, the specs look the same but am I making a false ecomany ? My heating system is for a normal size 3 bed house (12 rads)with a combi boiler and emersion tank. Many thanks for any help.