A bain marie is a set of gastronorm pans sitting in a heated water tank, controlled by a thermostat. Whatever food goes in the pans is held hot, and the point is food safety as much as convenience: cooked food needs holding above 63 degrees to keep bacteria at bay, and that is exactly what this kit does.
Do you actually need one?
It is not essential, and plenty of caterers trade without one. Its real home is bigger events, football matches, markets and shows, where you serve a lot of people at once. If those are in your plan, it earns its place.
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It lets you cook ahead. Expecting a breakfast or lunchtime rush, you can cook 10 or 20 burgers, sausages and eggs in advance and hold them hot in the bain marie. When the queue forms, the food is ready to serve, no reheating, no bottleneck at the griddle.
Maintenance and the driving tip
Wash each gastronorm pan thoroughly at the end of the day and change the water in the tank regularly for hygiene, letting it cool before you drain it. And the tip everyone learns the hard way: if you are driving to your pitch, empty some of the water out first or it will slosh over and soak your floor.
Buying one
Second-hand bargains exist, but check the CE/UKCA mark and that it is fit for commercial use before you hand over money. If you cannot verify it, walk away. For new kit with a warranty, see the commercial bain marie range at mobcater.com. Worth checking gastronorm pan sizes there too so you know the capacity you are getting. Holding temperatures are one of the things your EHO will check, so whatever you buy, make sure it genuinely holds 63 degrees or above.
Every LPG appliance needs a Gas Safe engineer
Whatever you cook on, gas kit must be fitted and certificated by a Gas Safe registered engineer before you trade, it’s the certificate your insurer and the EHO both ask to see. The MobCater app’s directory lists 61 verified engineers who work on catering trailers and vans, search by region, check ratings and experience, and call straight from your phone.
Find a Gas Safe engineerThe directory comes with Business-Ready · the app itself starts free, no card needed
Frequently asked questions
What temperature must a bain marie hold food at?
Above 63 degrees Celsius. That is the UK hot holding requirement, and it is one of the first things an EHO checks. Your bain marie's thermostat does the work, but verify it with a probe thermometer.
Is a bain marie essential for a burger van?
No. It earns its keep at big events where you serve many people at once. For a quiet roadside pitch you can trade without one.
Can you drive with water in a bain marie?
Partially empty it first. A full tank will slosh over the sides on the road and soak your van floor.