Technical Advice - Showers

Top trouble-shooting installation tips

Why can I get a mix of water on my BSM when I have it turned to bath but it runs cold when turned to shower? Sounds like you have unequal water pressures. Fit a pressure reducing valve to the higher pressure side.

Why does my basin waste leak? It needs silicone between the flange & basin (it will appear as if it is the plug that can’t hold water but the water is seeping under the flange and into the slots on the waste underneath).

Why isn’t water coming through the douche on my 3-hole bidet? You need to remove the perforated plate and wind up the slotted screw (wind down to reduce water flow).

My mixer tap is leaking Remove the head (by removing the “indice cap” or loosening a grub screw) then clean the seating and the rubber washers or ceramic disk valve.

Water trickles from the tap after turning it off This is caused by ‘capillary action’ and residual water in the spout is being siphoned out. It should only last for a second or two, and is a nuisance rather than a fault. If the tap is fitted with an aerator, this can be replaced with a more restrictive type to reduce the amount of water that trickles out.

Why does water come up through the pop up rod hole on a three hole mixer? Sounds like the packing nut on the spout is loose (second nut up from the bottom). Tighten it up and the problem should be solved.


Site Conditions
Our bathroom and kitchen taps are designed to work on water pressures from 0.1 bar (1.45 p.s.i) up to 8 bar (116 p.s.i) at temperatures up to 65?C.
Note! Some models require a minimum pressure of 1 bar (14.5 p.s.i). See individual products for more detail.

Inlet Connections
Inlet connections will vary from model to model. The most common inlet connections are 1/2" and 3/4" BSP male threads, 15mm copper pipes and 1/2" BSP flexible hoses. See individual products for more detail.

All of our bathroom and kitchen taps are constructed from high grade materials. The bodies are 100% brass.

Valve Type
We use a number of different types of valve design throughout our kitchen and bathroom ranges. They are:

Non-Rising Spindle:
This type of valve is similar to the rising spindle type, the difference being the spindle will not move up and down when turned on or off. This type of valve and the rising spindle valve are probably the sort of valve that most people will be accustomed to.

Rising Spindle:
With this type of valve, when the tap is turned on and off, the spindle on which the head is attached will move up and down accordingly.

1/4 Turn Ceramic Disc:
This type of valve incorporates a ceramic disc mechanism to control the flow that will either turn through 90? or 180?. They are quicker to operate then the more traditional Rising and Non-Rising valve designs. This type of valve has excellent resistance to wear and corrosion.

Ceramic Single Lever Cartridge:
This type of cartridge is used on the single lever type mixers mainly in the contemporary range. From the mid position the lever will turn through 45? on both the hot and cold side. These cartridges utilise long lasting ceramic disc technology and, as with the 1/4 turn ceramic disc valves, have excellent resist

Top trouble-shooting tips


I’ve installed an electric shower and the low pressure light won’t turn off If the water gets warm, then the water supply pressure is only just sufficient to operate the shower. The low pressure light may not show at different times of the day, as the mains water pressure varies. If it doesn’t get warm then there is insufficient water pressure. Check the mains water pressure which must be a minimum of 1 Bar, and check the filter in the joint between the solenoid valve and the inlet connection elbow as it may be partially blocked.


I’ve fitted a shower pump but the shower pressure is unchanged Check that the pump is installed correctly. If there is air in the pump due to incorrect installation, or if the water is too hot, it will reduce the amount of water that the pump can circulate.


The shower pump is making a lot of noise Check that the location of the pump and the water supply connections are as shown in the installation book. The pump should be at the base of the hot water cylinder and hot water should be taken from the domestic hot water supply pipe below the vent tee or an ‘Essex flange’ in the side of the cylinder.


The shower pump won’t start Make sure that the electricity is turned on and the fuse is ok. Check that water is flowing from the shower head when the shower mixer valve is turned on. If not, lower the shower head into the shower tray or bath and check again. If the pump starts, turn off the mixer and try again with the shower head back on the rail. If it still doesn’t start, it may be necessary to fit a negative head switch.


I’ve fitted a bar shower and the water isn’t getting hot enough Check water supply pressures. Thermostatic valves require reasonably balanced water pressures i.e. not gravity hot and mains cold.


I’ve fitted a power shower and can’t get the pump to turn on. I’ve checked water flows from the shower head Check that the purge switch (inside the cabinet) is set to “shower” position, or that ‘Eco’ button (if fitted) is not switched on.


The temperature of the shower is fluctuating. What should I do to make it constant? Check that the hot and cold water supply pressures are reasonably balanced. Check that the combi boiler (if used) is not cutting in and out and if so, adjust the boiler temperature either up or down slightly.


Water is coming from the cold water tank overflow pipe, and there is warm water in the tank Hot water is flowing from the shower, up the cold water pipe and into the tank. Check the non-return valves on the shower, or fit an in-line non-return valve in the cold water shower supply pipe to stop the problem.


I’ve fitted a new thermostatic valve and it gives only cold or hot water, but does not mix Check that the supplies are connected correctly. The hot supply should be on the left hand side and cold on the right.

We offer a superb range of contemporary and traditional mixer showers with a choice of thermostatic or manual controls. Mixer showers draw and mix both hot and cold water directly from the cold water storage tank and the hot water cylinder or both from the mains fed supply. They are ideal for homes with readily available hot water and will deliver a truly refreshing shower.

For further technical advice on your type of shower, please select the shower type below:

Thermostatic Showers

Manual Showers

Pressure Balancing Valves

Electric Showers

Shower Pumps

ance to wear and corrosion.

Product Approval
Bristan taps are individually tested and are designed to conform to a number of British Standards including BS1010 and BS 5412. They have also been tested by the Water Research Centre and are approved or pending approval, by the Water Regulations Advisory Scheme and comply with all UK water regulations (subject to correct installation).

Each Bristan tap is guaranteed for 5 years covering all manufacturing defects. This does not apply to any products that have been damaged during fitting or miss-use. Gold and special colour finishes are often softer than chrome plate; therefore a 3 year guarantee covers these finishes.

All plumbing installations must conform to the legal requirements laid down in the current Water Regulations.

Bristan Customer Service
If for any reason you need advice on technical information, installation or maintenance, call our highly trained staff for assistance on 0844 701 6273 or click here to email us.