Most people only think about their hot water cylinder when it stops working. By then a valve has usually been sticking or dripping for a while, or a gas burner has been running dirty, and the repair happens on the worst possible morning at the worst possible price.
A hot water service is a short, planned visit that tests the parts that wear, checks the cylinder is safe and secure, and tells you honestly how much life it has left. It suits electric cylinders, gas storage and continuous flow units, and heat pump water heaters.
Pricing: quotes are free, and every job gets a fixed price before we start, so there are no surprises on the invoice.
Hot Water Servicing Jobs We Handle Across Wellington
- Hot water cylinder service
- Relief valve testing
- Tempering valve checks
- Heat pump hot water service
- Anode and element checks
- Pre-sale cylinder checks
Why servicing pays off
Valves on a mains pressure cylinder do real work every day. The expansion control valve opens each time the water heats, and the temperature and pressure relief valve is the last line of defence if the thermostat fails. Both wear out. The tempering valve keeps water at bathroom fixtures within safe limits, and when it sticks you get water that is either scalding or lukewarm. Catching these early is cheaper than an emergency call and kinder to the cylinder. If the cylinder has already stopped heating or is leaking, book hot water repairs rather than a service.
What a hot water service covers
What we do depends on whether you have an electric cylinder, gas hot water or a heat pump, but a typical service includes:
- Testing the temperature and pressure relief valve and the expansion control valve
- Checking the tempering valve and measuring water temperature at the taps
- Checking incoming pressure and the pressure limiting valve where fitted
- Inspecting the cylinder, fittings and drain lines for leaks or corrosion
- Checking the seismic restraints are present, sound and tight
- Gas units: cleaning the burner and checking ignition, flame and flue
- Continuous flow units: cleaning inlet filters
- Heat pumps: cleaning filters and checking the outdoor unit and condensate drain
How It Works
Seismic restraint in Wellington
A full cylinder is heavy, and in a strong earthquake an unrestrained one can tip, tear its pipe connections and flood the house, or pull a gas line loose. The Building Code requires hot water cylinders to be restrained, and the reason is easy to see in Wellington. The Wellington Fault runs through Karori and the city and along the Hutt Valley, and GNS research has put the chance of it rupturing in the next 100 years at about 11%, with many other active faults in the region as well.
Older cylinders in villas, cottages and state houses may have been fitted with light straps, or none, and fixings can loosen over decades. During a service we check the straps or brackets, the fixings into the framing and the flexibility of the pipe connections, and quote to upgrade anything that will not hold.
Soft water, anodes and steel cylinders
Tiaki Wai classes the supply to Wellington, the Hutt Valley and Porirua as soft, under 100 mg/L of calcium carbonate, and it adjusts pH during treatment to reduce corrosion in pipework. That means heavy scale is not the main threat to cylinders here the way it can be in hard-water areas, so routine flushing is rarely needed on town supply.
Corrosion inside steel tanks still happens. Many steel mains pressure cylinders have a sacrificial anode rod that corrodes so the tank does not, and once it is used up the tank starts to go. A US manufacturer's manual we reviewed recommends inspecting the anode yearly and replacing it when about 150 mm of core wire is exposed. Not every New Zealand cylinder has an accessible anode, and copper and stainless cylinders work differently, so we check what yours has and follow the maker's instructions.
How often to service
As a rule of thumb, gas appliances benefit from a yearly check, while electric cylinders can often go longer between visits. Book sooner if your relief valve drips constantly, the water temperature has changed, the cylinder is more than ten years old, or you are buying or selling a house.
Cost
If we find a part that needs replacing, we tell you the price before fitting it, and you can decide on the spot or later. If the cylinder itself is near the end of its life, we say so plainly and give you time to plan a replacement on your terms instead of on a cold Monday morning in July.
Why Choose Cheeky's Plumbers for Hot Water Servicing
Valves tested, not just looked at
We operate the relief and expansion control valves, check the tempering valve and measure the temperature at the taps, because these are the parts that wear.
Restraints checked for earthquakes
Every service includes a look at the cylinder's seismic restraints and pipe connections, with a quote to upgrade anything that will not hold.
Checked for your cylinder type
Copper, stainless and steel cylinders age differently, so we check for an accessible anode and follow the maker's instructions.
Written service note
You get a note with photos of what we checked, what we found and what needs attention, so you can plan rather than react.
Parts priced before fitting
If a part needs replacing you get the price before we fit it.
Hot Water Servicing FAQs
How often should a hot water cylinder be serviced?
Gas systems benefit from a yearly check. Electric cylinders can often go longer, but should be checked if the relief valve drips constantly or the temperature changes.
Do I need to flush my hot water cylinder in Wellington?
Rarely on town supply, because Tiaki Wai classes the water as soft. If you are on tank or bore water, or we see sediment, we may recommend it.
Is my cylinder properly restrained for an earthquake?
If you cannot see solid straps or brackets fixed into the framing, it may not be. We check restraints on every service and quote to upgrade them.
What is a tempering valve and why test it?
It blends hot and cold water so the water at bathroom fixtures stays within safe limits. If it sticks, you get water that is too hot or too cool.
How much does a hot water service cost?
Any extra parts are priced and agreed before we fit them.
Can you service gas continuous flow units?
Yes. Our certifying gasfitters service gas storage and continuous flow units, including burner, ignition and filter checks.
Hot Water Servicing Across Wellington
Our hot water servicing team works in every Wellington suburb. Find your local plumbers:
Hot Water Servicing Guides
- Hot Water Cylinder Seismic Restraints: Is Yours Ready for a Wellington Quake?
- Is Wellington Water Hard or Soft? What It Means for Filters and Cylinders
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