You may not be able to. If the house is brand new, chances are high that the Plumbing fixtures were installed with a flow limiting device to reduce water usage. This is typically a small piece of plastic that can be removed from the fixture. Your plumber or contractor could tell you about it, but can't remove it, code requires they install it with it in place to pass inspection. What you do after inspection is up to you. If the house is several decades old, the piping may be corroded. If it is galvanized, it could be close to plugged. In that case, replacing the water pipes can lead to a dramatic increase in pressure. If you are far away from the source of the water pressure, usually a water tower someplace, the solution is more complex and expensive. You could install a reservoir in your home, usually the attic, and use gravity to improve your pressure. That requires insuring structural support and a pump (sometimes very noisy at night!) in the house.
Sudden use of water in other areas of the house can decrease water flow to the hot water heater causing an incoming pressure drop so the out ward flow decreases. In newer construction water pipes are run separately from the incoming line to other bathrooms, sinks and irrigation systems. Older construction usually had lines tapped off from one another feeding sinks, showers and toilets.
The force of the spray from a shower head has more to do with the water pressure delivered by your plumbing. Some shower heads do have a valve that allows pressure to build in the shower head, thus delivering a more powerful spray, but sufficient water pressure would be necessary from the source. Visit the home improvement store and talk about the various options with a knowledgeable salesperson.
i found a great website for discount shower heads, but it also has a great support section with step by step pictures and instructions, including tips on increasing water pressure. htp://www.showerstore.com
This does vary slightly according to the shower, but for a shower without a pump, using a gravity feed, a water pressure of at least 0.1 bar is recommended. If your water pressure is low you will need to install a pumped shower.
Your water pressure is low. Consequently, when cold water is diverted to another application such as a toilet or a sink, the amount of cold water available at the shower mixing valve decreases as the low pressure is unable to keep up with the shower's demand. This causes a hotter mixture at the shower head. The solution is to either improve the cold water supply to the shower or to replace the shower control valve with a temperature compensating type. Pressure balancing is the cheapest and simply changes the shower temperature according to the pressure in the cold and hot water lines. When the toilet or sink is used, reduced pressure to the shower valve is detected and the valve reduces the hot water pressure, thereby maintaining the temperature. The more sophisticated approach is a thermostatic shower control valve. These are significantly more expensive, but will not reduce the pressure at the shower head (a drawback of the pressure balancing valve). The thermostatic valve would be required when one shower control valve is operating several shower heads. Moen, Kohler and Delta all make both types of control valves. They can be readily obtained from a local plumbing supply house.
Because it effects the water pressure of the shower. This causes the temperature of the water in the shower to also change.
There is a screen and/or a water saver in the shower head. The screen may be plugged with sediment from in the water.
Its a loss in water pressure to the shower.
Is more water comming out your tub spout? if so change spout
Usually clogged shower heads. Turn water off and shower off. Screw shower nozzle off by hand or with pipe wrench. Turn water and shower on with nozzle head off if water flows clean or replace nozzle. If water pressure is still too low with nozzle off check shut off valve and open valve more. Make sure main water shut off for your house is open enough to allow adequate water pressure.
May be build up in the valve itself or the shower head.
Pump it into a storage tank and use an electric shower pump to increase pressure,Pump starts when a tap is turned on
I will say you can take a look at aquasana shower water filter.