Most people worry about water pressure being too low. Too high is quieter and more expensive. Pressure above what your plumbing was designed for strains every joint, hose and valve in the house, shortens the life of tapware and appliances, and can keep a cylinder relief valve dripping day and night.
A pressure reducing valve, also called a pressure limiting valve, sits on your incoming supply and holds the pressure inside the house at a safe, steady level. We test what you have now, fit the right valve and set it correctly.
Pricing: quotes are free, and every job gets a fixed price before we start, so there are no surprises on the invoice.
Pressure Reducing Valves Jobs We Handle Across Auckland
- Pressure reducing valve installation
- PRV replacement
- High mains pressure fixes
- Water hammer
- Pressure testing
- Flexi hose protection
Signs your pressure is too high
High pressure rarely announces itself directly, though water hammer is a common clue. Look for:
- Banging or shuddering pipes when a tap or appliance shuts off (water hammer)
- Flexi hoses bulging, kinking or failing early
- A cylinder relief or expansion valve dripping constantly
- Tap cartridges and toilet inlet valves wearing out quickly
- Showers that are harsh and splash out of the tray
- Leaks reappearing at joints that were recently repaired
What the rules say about pressure
Water supply in New Zealand homes falls under Building Code clause G12, with AS/NZS 3500.1 commonly used as the technical standard. AS/NZS 3500.1 limits static pressure at outlets inside a building, other than fire service outlets, to 500 kPa. Many tapware and appliance makers also set maximum inlet pressures in their installation instructions, and running above them can affect warranties.
MBIE has also issued a product recognition notice covering WaterMark-certified inlet pressure control valves, which gives a recognised route for compliant valves. We only fit valves that are approved for use on NZ drinking water supplies.
How It Works
How we fit and set a valve
We start by measuring your static pressure at the boundary, ideally with a gauge that records the peak, because pressure often climbs overnight when demand is low. If it is above what your home should see, we fit a pressure reducing valve on the main supply just inside your side of the meter, with an isolation valve and strainer to protect it.
The valve is set to suit your fixtures and cylinder, usually well below the 500 kPa limit. We then check the cylinder valves, relief valve and any expansion control valve, because they all interact with the new pressure setting.
What affects the cost
Pressure reducing valves are fitted. The total depends on:
- Pipe size and material at the installation point
- Valve type and whether a strainer and isolation valve are needed
- Access near the meter or where the supply enters the house
- Replacing an existing failed valve versus a new installation
- Related work such as cylinder valve or flexi hose replacement
High pressure in Auckland homes
Mains pressure is not the same across the city, and low water pressure is as common a complaint as high. Homes at the bottom of hills and close to network supply points tend to see higher pressure than those at the top, and pressure can change after network upgrades. A valve that was never needed when the house was built may be needed now.
Valves also wear out. Seats and diaphragms degrade, debris lodges in the valve, and a failing valve may let pressure creep up overnight. If your relief valve has started dripping or your hoses keep failing, it is worth testing an existing valve before replacing anything else.
Why Choose Cheeky's Plumbers for Pressure Reducing Valves
Peak pressure measured
We test with a gauge that records the peak, because pressure often climbs overnight when demand is low and a daytime reading can miss it.
Approved valves only
We only fit valves approved for use on NZ drinking water supplies, such as WaterMark-certified inlet pressure control valves.
Set to suit your fixtures
The valve is set for your tapware, appliances and cylinder, usually well below the 500 kPa limit, not left at the factory setting.
Expansion managed too
Fitting a valve changes how heated water expands, so we check the cylinder's expansion control valve every time and fit an expansion vessel where the system suits one.
Fixed price before we start
Pressure reducing valves are fitted, and the price is agreed before work starts.
Pressure Reducing Valves FAQs
What water pressure is too high?
AS/NZS 3500.1 limits static pressure at outlets inside a building to 500 kPa. Anything near or above that is worth reducing.
Will a pressure reducing valve weaken my shower?
Only to a safe level. Most people notice the shower is steadier, not weaker, once surges are removed.
How do I know if my pressure is high?
Banging pipes, dripping relief valves and repeated hose failures are common clues. A pressure test at the meter confirms it.
Do pressure reducing valves wear out?
Yes. Seats and diaphragms degrade over time. If problems return, test the valve before replacing other parts.
Why is my cylinder relief valve dripping?
It can be high mains pressure, a failing valve, or thermal expansion with no expansion control. We test to find which.
Do I need a valve if I already have one on the cylinder?
A cylinder valve controls the hot side only. A main pressure reducing valve protects the cold side and every fixture as well.
Pressure Reducing Valves Across Auckland
Our pressure reducing valves team works in every Auckland suburb. Find your local plumbers:
Pressure Reducing Valves Guides
- Low Water Pressure? How to Increase It in Your Shower and House
- Why Do My Pipes Bang? Water Hammer Explained for NZ Homes
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