No Australian rule bans trading without hot water, but heat sanitising needs 77 C for 30 seconds and hand basins need warm running potable water, so you can keep serving only while you can still hold both outcomes.
Skai Solutions builds phone agents for Australian and New Zealand venues, which means we hear about the bad mornings. This page gives you the three temperatures that actually govern a kitchen, what you can lawfully switch to, and when to shut the pass.
No regulator publishes a rule that says yes or no, and that is the honest starting point. What the Food Standards Code does is set an outcome. Hand washing facilities must be connected to or provided with a supply of warm running potable water. No temperature is attached to that requirement, which surprises most operators, and anyone quoting you a specific hand wash temperature from the Code is inventing it.
So the test is not "is there a law against trading". The test is whether you can still meet the outcomes the Code requires while the hot water is off. There are two of them that matter in a service: staff can wash their hands properly, and equipment and surfaces get sanitised. If you can hold both, you have a defensible position. If you cannot hold either, you are trading against the Code whatever the plumber says about arriving by two.
New Zealand works the same way through a registered food control plan rather than a one line rule. Your plan states how you wash hands and how you sanitise. If the hot water is off and your plan has no recorded alternative, you are outside your own plan, which is the thing a verifier actually audits. Our food control plan page covers what sits inside one.
Put these next to each other and the whole problem becomes obvious. Almost nothing written for operators does.
| What | Temperature | Source |
|---|---|---|
| Stored heated water, to control Legionella | not less than 60 C | AS/NZS 3500.4:2015 |
| Delivered to a basin through a tempering valve | 50 C | AS/NZS 3500.4:2015 |
| Heat sanitising by immersion | 77 C for 30 seconds | Food Standards Code 3.2.2 |
| Hand washing | "warm", no figure | Food Standards Code 3.2.3 |
The plumbing figures come from Tasmanian building standards guidance on heated water, which states that stored water must not be set below 60 C to kill Legionella, and that a tempering valve must deliver 50 C to sanitary fixture outlets such as basins. The sanitising figure comes from FSANZ guidance on cleaning and sanitising, which says heat sanitising by immersion means very hot water at 77 C for 30 seconds, under Standard 3.2.2 clauses 19 and 20.
Here is the conclusion nobody writes down, and it is ours rather than a regulator's. A compliant venue stores at 60 C and tempers the basin to 50 C. So no basin tap in your building can lawfully deliver the 77 C that heat sanitising needs. If you believed you were heat sanitising at the hand basin, you were not. Heat sanitising has to come from a dedicated sink fed before the tempering valve, or from a dishwasher running its longest and hottest cycle.
Closing a mid sized venue for a Saturday service is not a plumbing bill, it is a trading day. Take the average spend figures on our spend per head page against the covers your dining room turns, and a lost Saturday night is usually the single most expensive thing in the week. The plumber is a few hundred dollars. The night is thousands.
Which is exactly why operators improvise, and why the improvisation is usually the wrong one. Boiling a stockpot and tipping it into a hand basin gets you water that is too hot to wash hands in and nowhere near sustained enough to sanitise. It also puts a pot of boiling water at waist height in a moving kitchen.
If you cannot wash hands properly and you cannot sanitise, close the kitchen. Not the venue necessarily: a licensed room can often keep serving packaged drinks and pre packaged food while the kitchen is shut, and that keeps some revenue and most of the goodwill. Ring your local council environmental health officer and tell them before somebody else does. An operator who calls in a hot water failure and states the control measures is in a completely different conversation from one who is found mid service.
Write the whole thing down the same day: the time it failed, the temperatures you measured, what you switched to, what you stopped serving, and when it was restored. That record is your defence and it takes ten minutes. The same discipline applies to the other failure that shuts a kitchen without warning, which our power outage procedures page covers, including the food safety clock that starts the moment refrigeration stops.
One thing this page deliberately will not restate is how long cold food can sit out of temperature control. That has its own page and its own rules on our two hour four hour rule page, and a hot water failure does not change them.
If it is the warewasher rather than the supply, the symptom-by-symptom version is on commercial dishwasher not working, including the sanitising concentrations you can fall back on with no machine at all.
Most commercial hot water failures in hospitality are not sudden. They are a unit sized for the venue that opened in 2014 trying to serve the venue that trades in 2026, or an element quietly scaling up in hard water. Two habits cost nothing and catch almost all of it.
First, put a probe thermometer on the hottest tap once a week and write the number down. A unit sliding from 62 C to 55 C over a month is telling you something a month before it stops. Second, ask your plumber for the recovery rate of your unit, not just its capacity, and compare it with your worst hour. A 300 litre tank that takes two hours to recover is a 150 litre tank during a Sunday breakfast.
Water itself is a bigger line in a venue than most operators think, and the metering side of it sits on our restaurant water bill page. Whoever holds your food safety supervisor qualification should own the weekly temperature record, which is covered on our food safety supervisor page.
The hour you spend on hold to a plumber is the hour your phone rings with tonight's bookings and tomorrow morning's enquiries. Skai Solutions answers every call on the first ring, takes the booking and sends it through, so a failure in the back of house does not also cost you the front of house.
If your phone mostly carries suppliers and trades rather than bookings, a basic message taking plan is the right buy and it is not us. If it carries bookings during service, read what an AI receptionist for a restaurant actually does. Setup takes five days.
The same gap sits under warewashing: see whether an Australian commercial dishwasher has to reach 82C, which it does not, and what the Code asks for instead.
Can a restaurant stay open with no hot water in Australia?
There is no rule that says yes or no. The Food Standards Code requires hand washing facilities to have a supply of warm running potable water and requires surfaces and equipment to be sanitised. If you can still meet both outcomes you can trade; if you cannot, close the kitchen.
What temperature does hot water have to be in a commercial kitchen?
Stored heated water must be set to not less than 60 C to control Legionella, and a tempering valve delivers 50 C to basins, under AS/NZS 3500.4:2015. The Food Standards Code sets no temperature at all for hand washing, only that the water be warm.
What temperature is needed to sanitise with hot water?
FSANZ guidance puts heat sanitising by immersion at 77 C for 30 seconds, under Standard 3.2.2 clauses 19 and 20, or a dishwasher running its longest and hottest cycle.
Can I use hand sanitiser instead of hot water?
No. Hand sanitiser is not a substitute for hand washing in a food business. If the hot water is off, provide a temporary warm water supply to the hand basin with soap and single use towel still in place.
Can I sanitise without hot water?
Yes. Chemical sanitising is an accepted alternative to heat under the Code, so a correctly diluted food grade sanitiser holds the outcome while the heat route is unavailable. Record the change, the time and who made it.
Do I have to tell the council if my hot water fails?
There is no automatic notification duty, but ringing your environmental health officer, stating what failed and what control measures you put in place, puts you in a far better position than being found mid service without them.