Combi bolier - how can i increase pressure in shower?

[smilyali]

Hi I'm new here so hoping someone can help, would really appreciate some advice!
We've just had our old boiler system removed and had a combi boiler installed. We have 3 toilets, 2 showers, 14 radiators. Water pressure in all basin taps and bath taps is strong (cold and hot) - no problems there. The showers run on the combi system (with a thermostat, not mixer) however the pressure is very low compared to the taps. The showers are both ceiling mounted (rain showers) - does the size of the house play a part in this? How can we increase the pressure to the showers, as the taps are absolutely fine (strong). Would really like stronger pressure in the showers :-(
Thank you in advance for your help.
Combi is a Wocester Greenstar 28i Junior
Ali

 

[PlumbBobBob]

what size are the heads for the showers because the bigger they are compared to a normal hand held head the flow will be the same but spread over a larger area i don't think there is much you can do apart from getting a smaller head but i stand to be corrected

 

[AWheating]

as steve has said it may be down to the flow of the hot. The combi boiler has to restrict the flow rate of the hot supply to obtain the desired temps.

 

[WHPES]

Change the shower head for an eco head - you get a good shower but it is more economical