unvented water heater

Hi all, We have an OSO Direct 20 RD Unvented water heater that heats just the water (seperate electric radiators) and the water pressure from the hot taps and shower is really poor. Does anyone know if this is likely due to an issue with this water heater or what the best way to rectify this...

Hi, I have low pressure on an electric hot water cylinder so I have been trying to flush it. I opened the spring loaded drain cock which seemed to drain for some time with the hot tap open, but the next time I tried it after opening the cold inlet valve for 30 secs it just spurts water from the...