{"id":98332,"date":"2026-04-23T05:43:07","date_gmt":"2026-04-22T20:13:07","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=98332"},"modified":"2026-04-22T15:40:35","modified_gmt":"2026-04-22T06:10:35","slug":"taps-running-too-hot-theyre-probably-ill-tempered","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/taps-running-too-hot-theyre-probably-ill-tempered\/","title":{"rendered":"Taps Running Too Hot Or Cold? They’re Probably Ill Tempered"},"content":{"rendered":"

\"AIf you’re getting scalded by the water pouring out of your taps or suffering through underwhelmingly tepid showers, there’s a likely culprit: the tempering valve.<\/p>\n

Why Are Your Taps Running Too Hot Or Cold?<\/h2>\n

Hot water storage systems are supposed to keep water at a temperature of at least 60C to prevent bacterial problems like legionella. However, this is a dangerously hot temperature to be coming out of the tap, where the water temperature shouldn’t exceed 50C.<\/p>\n

A tempering valve or thermostatic mixing valve is supposed to mix cold water into the hot to ensure water streams out into your sink or bathtub at a temperature that doesn’t poach eggs.<\/p>\n

If your water is running too hot or too cold across all your taps, your tempering valve may not have been set up correctly when the system was installed, or it may have malfunctioned.<\/p>\n

If only one tap is having issues with temperature or pressure, it’s instead likely an issue with the tap itself or a localised blockage.<\/p>\n

Painful Bills Replaced By Painful Showers<\/h2>\n

I recently switched from a gas hot water system over to a hot water heat pump. While it felt terrific to stop pouring money down the drain every gas bill (our solar means the heat pump is close to free to run<\/a>), a new problem emerged: instead of burning gas, we were burning our skin.<\/p>\n

I knew the situation was serious when my partner, who likes to shower at the approximate surface temperature of the sun, complained that the water was too hot even for her.<\/p>\n

Fortunately, the cause was simple to diagnose and even simpler to fix. When our hot water heat pump had been installed, the tempering valve hadn’t been set up correctly.<\/p>\n

What Is A Tempering Valve?<\/h2>\n
\"Tempering

The tempering valve sits at the intersection of three pipes and features a coloured cap.<\/p><\/div>\n

A tempering valve is a 3-way mixing valve which blends cold water in with the hot water coming out of your storage tank. It isn’t just important for hot water heat pumps – any kind of storage-based hot water system benefits from one.<\/p>\n

Tempering valves should be tested once a year to make sure they’re still doing their job – run the hot water over a thermometre to check the water temperature doesn’t exceed 50C.<\/p>\n

It is the cheapest and most common way to temper hot water in residential homes. Another alternative is a thermostatic mixing valve (TMV), which costs much more but works with greater accuracy through the use of a sensitive thermostatic element which expands and contracts in response to changes in water pressure or temperature.<\/p>\n

TMVs are more common in commercial settings, and are mandatory in high risk facilities such as hospitals & childcare centres.<\/p>\n

Although our issue was water running too hot, Tim Johnston, the founder of hot water heat pump installer Powrhouse<\/a>, says the more common complaint is typically about the water running not quite hot enough.<\/p>\n

\u00a0\u201cMost complaints we get are that it’s too cold, so the valve needs to be adjusted upwards. Most heat pumps are replacing 25-year-old gas systems that probably don’t have a tempering valve at all, and the customer is used to very hot water,\u201d Tim says.<\/p><\/blockquote>\n

How To Adjust A Tempering Valve<\/h2>\n
\"A

The tempering valve for my system has an orange cap, which is typical for hot water heat pumps.<\/p><\/div>\n

Your tempering valve will be found at the intersection of piping beside your hot water system. It should have a protective plastic cap, with the colour dependent on what type of system you have – likely orange or yellow for solar hot water or heat pump systems, and blue\/green\/black for gas or resistive electric storage systems.<\/p>\n

Take the cap of the valve off and turn it around so the triangle indent is facing inwards, and use that to turn the triangle-shaed valve towards the side marked C (for cold) to reduce the temperature or to the side marked H (for hot) to increase it.<\/p>\n

\"\"

Using the cap to adjust the tempering valve.<\/p><\/div>\n

You should reduce the temperature to 50 degrees in line with regulatory standards.<\/p>\n

To confirm your water temperature, turn the hot water on at the tap, wait until it’s reached maximum heat levels, and run a thermometer under it. Go back to the tempering valve and adjust accordingly if it is still a little too hot or cold.<\/p>\n

Regular Checks Of Your Tempering Valve<\/h2>\n

Once you’ve got it right, run a thermometer under a tap every 6-12 months to ensure the temperature is still consistent – this way you’ll spot if there’s been a tempering valve malfunction or some other issue.<\/p>\n

During these periodic checks, also inspect for leaks, drips, signs of corrosion or unusual noises – these might indicate the valve needs to be cleaned or replaced.<\/p>\n

Typically, a tempering valve needs replacment every 5 to 7 years, for which a professional plumber is best.<\/p>\n

What About Your Hot Water System’s Temperature?<\/h2>\n

With our iStore hot water heat pump<\/a> you can check what temperature a hot water heat pump is running at on the touchscreen, where you can also adjust the temperature. This might seem a more straightforward way to sort things out when the water is too hot or cold.<\/p>\n

This however is the temperature of the water within the heat pump’s storage tank – as mentioned earlier, you actually want this at 60C or higher to kill off bacteria, and also to ensure the hot water stays hot for longer without constantly having to use more electricity to keep it warm.<\/p>\n

So ensure the hot water system itself is set to at least 60C, and make the other adjustments at the tempering valve to cool the water to a more comfortable level.<\/p>\n

For more on hot water systems, read our dedicated guide to hot water heat pumps.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

If you’re getting scalded by the water pouring out of your taps or suffering through underwhelmingly tepid showers, there’s a likely culprit: the tempering valve.<\/p>\n","protected":false},"author":39,"featured_media":98903,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[789],"tags":[],"class_list":["post-98332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hot-water-heat-pumps","entry"],"acf":[],"yoast_head":"\nTaps Running Too Hot? 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Across his career Max has won multiple awards for his feature stories for The Guardian and The Saturday Paper, fact-checked energy claims for Australian Associated Press, launched the climate solutions newsletter Climactic, and covered the circular economy for sustainability thinktank Metabolic. 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With household electrification gathering pace and hot water heat pumps on the rise, we've been vetting plumbers to\u2026","rel":"","context":"In "Hot Water Heat Pumps"","block_context":{"text":"Hot Water Heat Pumps","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/hot-water-heat-pumps\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/05\/exploded-hose-wall.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/05\/exploded-hose-wall.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/05\/exploded-hose-wall.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/05\/exploded-hose-wall.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/05\/exploded-hose-wall.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":14874,"url":"https:\/\/www.solarquotes.com.au\/blog\/conserving-hot-water-gives-better-return-diverter-relay-heat-pump-hot-water-system\/","url_meta":{"origin":98332,"position":1},"title":"Conserving Hot Water Gives A Better Return Than Any Diverter, Relay, Or Heat Pump Hot Water System","author":"Ronald Brakels","date":"September 12, 2017","format":false,"excerpt":"I've been writing a lot about hot water lately and how to use the energy of the sun to get it.\u00a0 In fact, I've been concentrating on it so much I've neglected my other duties and gotten into hot water as a result.\u00a0 Mind you, this may have all been\u2026","rel":"","context":"In "Solar Hot Water"","block_context":{"text":"Solar Hot Water","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-hot-water\/"},"img":{"alt_text":"shower of money","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/save-hot-water2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/save-hot-water2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/save-hot-water2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/save-hot-water2.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/save-hot-water2.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/save-hot-water2.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":87949,"url":"https:\/\/www.solarquotes.com.au\/blog\/wifi-hot-water\/","url_meta":{"origin":98332,"position":2},"title":"Does Your Hot Water Need Wi-Fi?","author":"Anthony Bennett","date":"December 6, 2024","format":false,"excerpt":"I inadvertently brought a flyer home from a trade show recently, and my wife did a double take that stopped her and the recycling process in its tracks. She was fascinated and horrified at the WiFi control logo on this hot water tank \"I can't even have a shower in\u2026","rel":"","context":"In "Solar Hot Water"","block_context":{"text":"Solar Hot Water","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-hot-water\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/11\/heatpump-wifi-header.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/11\/heatpump-wifi-header.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/11\/heatpump-wifi-header.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/11\/heatpump-wifi-header.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2024\/11\/heatpump-wifi-header.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":14267,"url":"https:\/\/www.solarquotes.com.au\/blog\/sun-flux-review-hot-water-with-dedicated-solar-pv-panels\/","url_meta":{"origin":98332,"position":3},"title":"Sun Flux Review: Hot Water With Dedicated Solar PV Panels","author":"Ronald Brakels","date":"August 25, 2017","format":false,"excerpt":"I recently wrote about solar hot water diverters[1. And only managed one major breach of the laws of physics in the process.] which use surplus electricity from an existing rooftop solar system to heat water. Another option for heating your water with solar electricity is to use dedicated solar panels.\u2026","rel":"","context":"In "Solar Hot Water"","block_context":{"text":"Solar Hot Water","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-hot-water\/"},"img":{"alt_text":"Sun Flux Direct PV Hot Water System","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/sun-flux-2.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/sun-flux-2.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/sun-flux-2.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/08\/sun-flux-2.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":14223,"url":"https:\/\/www.solarquotes.com.au\/blog\/solar-hot-water-diverter-comparison\/","url_meta":{"origin":98332,"position":4},"title":"Comparing Solar Hot Water Diverters Available In Australia","author":"Ronald Brakels","date":"September 5, 2017","format":false,"excerpt":"Update: since publishing this article commenters have made us aware of 3 other hot water diverters on the Australian market, the 'Dimplex\u00a0Free-E' and, The Fronius OhmPilot and a unit from SolarEdge. We'll add these to the comparison table as soon as we have enough info. If you know of any\u2026","rel":"","context":"In "Solar Hot Water"","block_context":{"text":"Solar Hot Water","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/solar-hot-water\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/hot-water-diverter-comparison.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/hot-water-diverter-comparison.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/hot-water-diverter-comparison.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2017\/09\/hot-water-diverter-comparison.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":90136,"url":"https:\/\/www.solarquotes.com.au\/blog\/hot-water-heat-pump-warranties-ranked-from-best-to-worst\/","url_meta":{"origin":98332,"position":5},"title":"Hot Water Heat Pump Warranties Ranked From Best To Worst","author":"Ronald Brakels","date":"March 11, 2025","format":false,"excerpt":"Hot water heat pump systems are great for saving energy, but there's a major problem dogging them like an overly friendly labrador that has been rolling in fish guts.\u00a0 Most warranties stink!\u00a0 I can only think of four brands commonly sold in Australia with warranties I consider close to acceptable.\u2026","rel":"","context":"In "Hot Water Heat Pumps"","block_context":{"text":"Hot Water Heat Pumps","link":"https:\/\/www.solarquotes.com.au\/blog\/category\/hot-water-heat-pumps\/"},"img":{"alt_text":"A picture of a heat pump warranty book cover","src":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/Screenshot-2025-03-11-091439.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/Screenshot-2025-03-11-091439.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/Screenshot-2025-03-11-091439.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/Screenshot-2025-03-11-091439.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2025\/03\/Screenshot-2025-03-11-091439.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/98332","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/comments?post=98332"}],"version-history":[{"count":26,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/98332\/revisions"}],"predecessor-version":[{"id":98935,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/posts\/98332\/revisions\/98935"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media\/98903"}],"wp:attachment":[{"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/media?parent=98332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/categories?post=98332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.solarquotes.com.au\/blog\/wp-json\/wp\/v2\/tags?post=98332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}