Best LPG Bain Maries for Mobile Catering: UK Sizing & Buyer’s Guide (2026)
Last updated: July 2026
In 30 seconds:
- An LPG bain marie holds cooked food above 63°C with no mains power. Stocked units start from £399.
- Size by menu: a 4-pot suits 1–2 hot dishes; a 6-pot runs a full menu.
- Our LPG units burn propane at 37 mbar and have flame failure protection.
- Wet heat is gentler on food — add water to the tank before you light it.
- Installation should be done by a Gas Safe engineer and goes on your CP44 certificate.
Planning your gas load? The LPG cylinder run-time calculator shows how long a 19 kg bottle lasts against each appliance.
A wet-heat LPG bain marie is the standard hot-holding equipment for UK food vans and trailers. It is widely regarded as the safest way to keep sauces, curries and beans at serving temperature when you have no mains hook-up.
Why LPG? Most pitches have no electricity. A 3.3 kW propane burner brings a full water tank up to holding temperature and keeps it there all service, on the same cylinder that runs your griddle.
Which size? Count your hot menu lines, not your budget. Each pot is one dish. Four pots cover a burger van; six pots cover a full breakfast or curry menu.
The honest summary: the most expensive mistake isn’t buying the wrong brand — it’s buying too small. Traders who squeeze three dishes into a 4-pot end up swapping pots mid-service, dropping food below 63°C and queueing customers while it reheats. Size up if you’re on the fence.
What Size Bain Marie Do You Need?
Start with three questions. How many hot dishes are on the menu? How much counter space have you got? And is there any mains power at your pitches?
| Your setup | Hot menu lines | Pick | Counter width needed |
|---|---|---|---|
| Burger / jacket potato van | 1–2 (beans, onions, chilli) | 4-pot LPG | ~590 mm |
| Breakfast van, curry or carvery menu | 3–6 | 6-pot LPG | ~870 mm |
| Event pitch with mains hook-up | Any | Electric wet bain marie | 300–750 mm |
Capacity is easy to work out. Each GN 1/4 pot is 6 inches deep and holds roughly 4 litres. Call that 15–20 ladled portions of beans, curry or gravy per pot. A 4-pot unit therefore holds around 60–80 portions at once; a 6-pot closer to 100–120.
Counter space is the other half of the decision. The stocked 4-pot is about 590 mm wide and 430 mm deep; the 6-pot stretches to about 870 mm. Measure your worktop before you order — that 280 mm difference matters in a small trailer.
Wet Heat vs Dry Heat
A wet bain marie heats a water bath under the pots. A dry unit heats the air around them. Wet heat wins for mobile catering: it spreads heat evenly, holds temperature steadily and stops sauces catching or crusting at the edges.
The trade-off is water. You fill the tank before lighting, top it up during long services and drain it at close-down. Every LPG bain marie we stock is a wet unit — never light one dry, and never let the water level drop out of sight.
What to Look for When Buying
- Flame failure device (FFD). Cuts the propane if the flame goes out. Non-negotiable kit for enclosed vans — both stocked ranges have it.
- Piezo ignition. Push-button spark, no matches next to an open gas valve.
- Standard GN pots. Gastronorm sizing means replacement pots and lids are cheap and everywhere.
- Stainless build with a drain tap. You’ll drain the tank daily — a tap beats tipping 10 kg of hot water.
- Weight. These units travel. A countertop LPG unit you can lift alone beats a monster you can’t move.
The LPG Bain Maries We Stock
Infernus LPG 4-Pot Bain Marie (INGB-44) — from £399
Quick specs
- 4 × GN 1/4 pots, 6″ deep (~4 L each), with lids and drain tap
- 590 × 430 × 350 mm — fits a narrow van counter
- 3.3 kW single burner, propane at 37 mbar
- Piezo ignition + flame failure device
- Wet heat — fill the tank before lighting
Best for: burger vans, jacket potato vans and any trader holding one or two wet dishes through a lunch rush. The Infernus LPG 4-pot bain marie is the cheapest way onto propane hot-holding.
What it holds: baked beans, fried onions, chilli, curry sauce, gravy, mushy peas.
Don’t use it for: cooking from raw or reheating from cold — a bain marie holds food that’s already hot. It won’t dry-hold pies or pastries either; it’s a wet unit.
Trade-off: one burner heats the whole tank, so all four pots sit at the same temperature. Stock moves quickly on this unit — check the product page for current availability.
Infernus LPG 6-Pot Bain Marie (INGB-66) — from £499
Quick specs
- 6 × GN 1/4 pots, 6″ deep (~4 L each)
- 870 × 430 × 350 mm — needs a wider counter run
- Same 3.3 kW burner, propane at 37 mbar, piezo + FFD
Best for: breakfast vans and full menus — three mains and three sides on heat at the same time.
Trade-off: for £100 more than the 4-pot you get 50% more holding space from the same burner — the running cost barely changes. The catch is width: measure for the extra 280 mm first.
Parry LPG Wet Bain Maries — 4-pot from £653, 6-pot from £918
The step-up choice: the Parry LPG wet bain marie is built in Britain by a catering manufacturer with decades of trade heritage, and spares support is excellent. Both the 4-pot and 6-pot Parry LPG versions are wet-heat propane units, in stock at the time of writing.
Best for: daily traders who want a British-built workhorse and long-term parts backup, and don’t mind paying more for it.
You can compare the full range on our bain marie category page.
LPG vs Electric: Which Do You Need?
If your pitches reliably have mains power, an electric wet bain marie is simpler — no cylinder, no gas engineer. The Parry electric range runs from the compact 2-pot NPWB2 (from £479, 3.0 kW on a standard 13 A plug) through the 4-pot NPWB4 (from £569) to the 6-pot PWB6 (from £739).
But be honest about your pitches. Markets, laybys and most events have no hook-up, and a 3 kW appliance is a big ask for a small generator. If you trade off-grid more than occasionally, LPG is the right call — it frees your generator capacity for fridges and tills.
Running Costs: What a Bain Marie Burns
A 3.3 kW burner uses roughly 0.24 kg of propane per hour flat out. In practice you run high only to bring the tank up to temperature, then turn the flame down to hold. As a rough guide, a 19 kg propane cylinder gives around 80 hours at full burn — for most traders that’s several weeks of service from one bottle.
Gas Safety and Installation
An LPG bain marie is a commercial propane appliance, and it should be treated like one:
- Gas Safe installation. Connection should be made by a Gas Safe registered engineer, and the appliance added to your CP44 gas safety certificate — event organisers typically ask to see it.
- Low-pressure propane only. These units run at 37 mbar through a low-pressure regulator. Never connect a high-pressure supply.
- Keep the air paths clear. Combustion air enters through the base and rear. Infernus guidance: 100 mm clear at the sides, 350 mm at the rear, 1.5 m above.
- Never wash the unit with water. A hose or jet will wreck the gas controls. Wipe down with a soft cloth instead.
- Close the cylinder valve after service, every time.
Looking After Your Bain Marie
We’ve published a full care series for LPG bain maries: how to set up and run an LPG bain marie at temperature, how to clean an LPG bain marie, the weekly maintenance and burner care checks, and troubleshooting when it won’t heat or the pilot goes out. Ten minutes with each will add years to the unit.
Frequently Asked Questions
What temperature should a bain marie hold food at?
Keep hot food at 63°C or above — that’s the UK hot-holding guidance. Below 63°C, bacteria multiply and an EHO inspection can fail you. Check pots with a probe thermometer through service and stir so there are no cool spots. If food drops below 63°C, reheat it fully or bin it.
What size LPG bain marie do I need for a food van?
A 4-pot unit suits vans serving one or two hot dishes, like beans and onions. Choose a 6-pot if you run three or more hot lines — curries, breakfasts or carvery-style menus. Each GN 1/4 pot holds roughly 4 litres, about 15–20 ladled portions. When in doubt, size up: empty pots cost less than lost sales.
Is wet heat or dry heat better in a bain marie?
Wet heat is better for most mobile menus. The water bath spreads heat evenly and stops sauces catching or drying at the edges. The trade-off is filling the tank before service and draining it after. All the LPG bain maries we stock are wet-heat units — add water before you light the burner.
Do I need a Gas Safe engineer to install an LPG bain marie?
Yes — connection should be made by a Gas Safe registered engineer, and the unit added to your CP44 gas safety certificate alongside your other propane appliances. Event organisers and councils typically ask to see it. Only ever use a low-pressure 37 mbar propane regulator — never a high-pressure supply.
Can I run a bain marie on butane instead of propane?
No — use propane. Butane stops vaporising at around 2°C, so it starves your appliances exactly when UK outdoor trading gets cold. Commercial mobile catering appliances are rated for propane at 37 mbar, which keeps working down to well below freezing. Butane belongs on patio heaters and camping stoves, not in a food van.
How much propane does an LPG bain marie use?
A 3.3 kW burner uses roughly 0.24 kg of propane per hour at full flame. In practice you heat up on high, then hold on a low flame that sips far less. A 19 kg cylinder gives around 80 hours at full burn — usually several weeks of real service.
Can I use an LPG bain marie inside a catering trailer?
Yes — that’s exactly what they’re built for, but ventilation matters. The burner draws combustion air through the base and rear, so never block those openings. Keep 100 mm clear at the sides, 350 mm at the rear and 1.5 m above the unit. Your Gas Safe engineer should confirm the trailer’s ventilation at installation.
What’s the difference between GN 1/4, 1/2 and 1/1 pans?
GN (gastronorm) is the standard catering pan sizing system. GN 1/1 is the full size at 530 × 325 mm; GN 1/2 is half of that; GN 1/4 is a quarter. Our stocked LPG bain maries take GN 1/4 pots, 6 inches deep — around 4 litres each. Because the sizing is standard, replacement pots and lids are easy to find.