Mains-Pressure Showers Without a Pump
Mains-pressure showering comes from an unvented cylinder or a strong combi, with both hot and cold arriving at balanced pressure.
Mains-pressure showering comes from an unvented cylinder or a strong combi, with both hot and cold arriving at balanced pressure. Where the incoming supply is good, this beats pumping every time.
Balanced pressure is the point
Thermostatic valves behave predictably when hot and cold arrive at the same pressure. Mismatched supplies cause the temperature swings people blame on the shower valve.
Flow rate is the limit
Pressure gets water to the head; flow decides how it feels. We measure both at the stopcock before recommending anything.
Multiple outlets
Two mains-pressure showers running together will divide the available flow unless the incoming supply and pipe sizing genuinely support both.
What to measure first
- Static pressure at the stopcock
- Flow rate in litres per minute at the kitchen tap
- Incoming supply pipe size and material
Who does the work
- Gas Safe registered engineers — registration 554328
- Worcester Bosch accredited installer
- John The Plumb Ltd, company registration 10026483
Get a properly performing shower
We will measure your incoming supply first, then recommend — rather than fitting hardware and hoping.
Questions we get asked
Can I pump a mains-pressure system?
Not in the usual sense. Where boosting is genuinely needed it requires an accumulator or a break tank arrangement.
Why is my mains shower weak upstairs?
Usually flow rather than pressure, and often an old small-bore or partly blocked incoming supply.
Do I need a bigger cylinder for two showers?
Bigger helps with duration; the simultaneous performance depends on the mains supply and pipework.