I am considering replacing my old standard boiler for a new high effeciency combi, but am concerned about drop in HW pressure / flow rate that can be experienced whilst showering if a tap is run elsewhere. The overall benefits of a combi are very tempting but the flow rate problem is a concern. Anyone have any experience of combi showering? Am I worrying unduly or should I stick with the existing system and just install a pump to get a decent shower? Small 4 bed house with single bathroom and one kitchen. Thanks.