Mr. Clog Plumbing

TMV & Tempering Valve Installation Sydney

Thermostatic mixing valves and tempering valves installed, serviced and replaced, to keep hot water at bathroom taps at a safer temperature.

No surprise bills: $0 call-out and a fixed price before any work starts.

Our guarantee: 12 months on our workmanship, in writing. What it covers

Hot water systems store water hot enough to scald. A tempering valve or thermostatic mixing valve (TMV) blends hot and cold water so the water reaching bathroom taps and showers is cooler and safer. In most homes a tempering valve near the hot water system does this. TMVs control the temperature more precisely and are used where people more at risk of scalds use the water, such as aged care, childcare and healthcare. We install tempering valves and TMVs, service them, and replace them when they fail. A common sign of a failing valve is hot water in the kitchen but lukewarm water in the bathroom. You get a fixed price before we start.

  • Thermostatic mixing valves (TMVs) installed
  • Tempering valves installed and replaced
  • Valves serviced
  • Lukewarm or fluctuating bathroom water diagnosed
  • Fitted with new hot water systems where required
  • Temperature checked at the outlets
  • Fixed price quoted before we start
  • 12 months on our workmanship

Fixed price quoted before we start. $0 call-out fee.

The usual choice in homes. Fitted near the hot water system, a tempering valve mixes in cold water so the hot water going to the bathrooms is a safer temperature. The kitchen and laundry are often left on full-temperature hot water.

A TMV controls the outlet temperature more precisely and is designed to shut off the hot water if the cold supply fails. They're used where people more at risk of scalds use the water, such as aged care, childcare and healthcare, and are usually fitted close to the outlets they serve.

Both types wear with use. TMVs in particular are often required to be serviced and tested on a regular schedule where they are installed. We service them and replace worn valves.

The classic sign of a failing tempering valve. The kitchen is fed straight from the hot water system, the bathrooms through the valve.

Shower water that goes hot and cold, especially when another tap is turned on.

If the bathroom taps run very hot, the valve may not be working, or there may be no valve fitted.

Water leaking from the valve body or its fittings.

How It Works

01

Hot water temperature at the taps, and the existing valve if there is one.

02

Service, replace or install, with a fixed price first.

03

Valve fitted or serviced on the hot water line.

04

Water temperature checked at the outlets the valve feeds.

Common Questions

Both blend hot and cold water to a safer temperature. A tempering valve is the usual choice in homes. A TMV controls the temperature more precisely and is used where people more at risk of scalds use the water, such as aged care, childcare and healthcare.

A failing tempering valve is the usual cause. The bathroom outlets are fed through it, and when it wears or clogs, they go tepid while the kitchen stays hot. It's a common repair.

Where one is required, we fit it as part of the installation. We'll tell you if it applies to your system.

Yes. They wear with use, and where they are installed they are often required to be serviced and tested regularly. We service TMVs and replace them when they need it.

We'd advise against it. The temperature is set for safety, and adjusting it without the right checks can leave the water too hot.

We give you a fixed price before we start, with a $0 call-out fee.

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We recently used Mr Clog Plumbing for our granny flat in Guildford and couldn't be happier with the service. Everything was handled professionally from start to finish, with great communication and workmanship…
George A.Guildford · October 2026
Absolute legend. Turned up on time, sorted the problem quickly and didn’t charge a fortune. Super easy to deal with and cleaned up after the job too. Will definitely be using him again and would happily recomme…
Samantha M.May 2026
Turned up on time and honest service, couldn’t ask for much more.
Danny D.May 2026

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