New pipe works and combi will be installed when renovating the 5 bed single storey extended bungalow its a bit long house and the boiler is on the rear side rather then central location of the house. With conventional design, the total pipe run with branching is around 45+45m for flow and return pipes for the total 9-10 radiators. Another design option is to put a manifold (with or without pump?) about 7m away from combi in a central location and then individual return/supply for each radiators. In this setup the total return/supply pipe length almost same as 47+47m but each radiator is about 3 to 7m away from the manifold. Whats your experience and opinion when we compare two design options? Which works better? Do we need a second pump to boost the flow?