Off-Grid Mobile Catering Setup UK: Power, Water & Propane Complete Guide (2026)
Last updated: May 2026
Pull up to a busy summer pitch with a mains hookup and trading is easy — flick the kettle on, fire up the urn, get coffees out. The reality of UK mobile catering is the opposite: most pitches have no power, no water tap and no gas point, so every appliance you run has to bring its own supply. This guide walks through the three off-grid utilities — power, water and propane — that decide whether a mobile catering setup actually works on day one or eats your weekend in workarounds.
An off-grid mobile catering setup is the standard configuration for UK food vans, trailers and event caterers operating without mains hookup, combining a propane gas system, a portable water rig and either an LPG generator or a battery-and-inverter bank for power. It is the accepted baseline for outdoor trading because UK summer pitches, festivals and roadside layovers rarely supply hookups, and the equipment most caterers buy (LPG fryers, LPG coffee machines, LPG griddles, LPG bain maries) is designed around exactly this combination.
Last updated: May 2026
The off-grid three: what every mobile catering setup needs
Three utilities run a mobile catering pitch: power, water and propane. Lose any one and trading stops. The job of the setup is to make each one portable, safe and big enough for a full trading day without a top-up. Most first-timers underestimate at least one of them — usually water capacity or generator size — and pay for the mistake on their first busy Saturday.
| Utility | Typical mobile solution | What it powers | Budget from |
|---|---|---|---|
| Power | LPG dual-fuel generator or battery + inverter | Lights, fridge, coffee machine electric mode, water pump, card terminal | £600 |
| Water | Onboard fresh + waste tanks, 12V pump, water heater | Hand-wash, food prep, equipment cleaning | £250 |
| Propane | 13kg or 19kg propane cylinders + 37mbar regulator + COMCAT-tested system | Fryers, griddles, coffee machines (gas mode), water boilers, bain maries | £150 (regulator + hose) |
Power: LPG generator, battery bank or a hybrid
Power is where most caterers either overspend or undersize. The decision boils down to three options: a propane dual-fuel generator, a battery-and-inverter setup, or a hybrid that runs the generator a few hours a day to top up batteries.
LPG dual-fuel generator
The standard choice for any setup with a coffee machine, fridge and lights running all day. A 3kW unit covers a coffee trailer or simple food van; a 5–7kW unit covers a fully kitted catering trailer with fridge, LPG coffee machine electric element, lighting and a water pump; an 8–12kW unit covers high-draw kit like commercial fryers running on full electric mode. Propane dual-fuel runs cleaner and quieter than petrol-only generators, and a 19kg cylinder typically gives 8–14 hours of runtime depending on load. The full MobCater LPG generators range (3kW to 12kW) covers every typical mobile catering setup.
If you’re not sure which size to buy, work backwards from your appliance loads — the LPG generator sizing calculator walks through it step by step.
Battery and inverter
A 12V deep-cycle battery (or a portable power station like a Bluetti or EcoFlow) feeding a pure sine wave inverter is silent, has no fuel cost on the day, and is welcome on festival pitches that ban generators after 10pm. The trade-off is capacity — a 2,000Wh battery runs a small fridge, lights and a card terminal for a day, but it will not run an electric kettle, a high-wattage coffee machine on full electric mode, or anything heating. Batteries are best paired with appliances that run on propane (LPG coffee machines, LPG fryers, LPG griddles), where the battery only has to cover the electronics.
Hybrid setup
Run the LPG generator for the busy 4–5 hour service window, then switch to battery for the quieter prep and pack-down hours. This cuts fuel cost, reduces noise after lunch service, and gives you a backup if the generator ever fails mid-trade. The hybrid setup needs a battery charger sized to the generator’s spare capacity — usually a 50A DC-DC charger paired with a 200Ah AGM or lithium battery does the job for most coffee and food trailers.
Water: fresh, waste and hot
Mobile catering water is three separate problems: storing enough clean water, getting rid of waste water, and producing hot water for hand-wash and equipment cleaning. Local authorities and event organisers commonly check all three before issuing a trading permit.
Fresh water capacity
Budget around 30–50 litres of fresh water per service for a small van and 80–120 litres for a full catering trailer. Food-grade polyethylene tanks (typically 25L, 45L or 80L) sit inside the unit and feed a 12V diaphragm pump rated 11–17 litres per minute. The pump should have a pressure switch so it cuts in automatically when a tap is opened. A pre-filter on the inlet keeps grit out of the pump and any downstream water heater.
Waste water capacity
Waste capacity should be at least equal to fresh capacity — councils commonly require this 1:1 ratio as part of the food hygiene rating inspection. Grey water from sinks and hand-wash basins runs into a tank that is emptied at the end of the day to a foul drain (never to a storm drain or onto grass). A clear sight tube on the outside of the unit lets you see fill level without lifting a lid.
Hot water
For tea, coffee and quick hot drinks the standard mobile choice is a propane water boiler. The Fracino Atlantis Mini Gas is the only propane water boiler made in the UK as of 2026 — 7-litre boiler, around 30 litres per hour, 1,800W gas with a 50W electric element, 90°C pre-set, and dimensions that fit a typical trailer counter (530mm H × 310mm W × 430mm D). For setups that already run a propane coffee machine, hot water for cleaning often comes from the coffee machine’s hot water tap instead. A propane-vs-electric water boiler comparison and the full spec breakdown live in the portable water boiler buying guide.
Propane gas: cylinders, regulator and the COMCAT chain
Propane is the only LPG that works for UK outdoor mobile catering. Butane fails to vaporise below around 2°C, which makes it unusable for winter trading and unreliable in any cold-weather pitch — so even on a hot summer day, the standing recommendation is propane. All commercial mobile catering appliances are rated for propane at 37mbar.
Cylinder sizing
The two cylinders that cover almost every mobile catering setup are the 13kg propane (best for a coffee trailer or single-appliance van) and the 19kg propane (best for a multi-appliance catering trailer). For a full day’s trading with a coffee machine, a fryer and a water boiler, expect to use roughly half a 19kg cylinder. Always carry a spare connected through a changeover valve so service never stops mid-customer. The full cylinder-size-to-use-case map is in the LPG cylinder sizes guide.
Regulator, hose and pressure
Every commercial appliance needs a 37mbar propane regulator (POL fitting on UK cylinders) and a high-pressure hose rated for catering use — typically rubber sleeved in braided steel and certified to BS 3212. Hose ends are crimped, never jubilee-clipped, and replaced every five years or sooner if the printed date code is missing. A drop-out shut-off valve at the cylinder end and an isolator at the appliance end are standard.
COMCAT-tested system + gas safety certificate
Any commercial mobile catering gas system should be installed and tested by a Gas Safe engineer holding the COMCAT 1, 2 and 3 qualifications (mobile catering, commercial catering, LPG). The engineer issues a Gas Safety Certificate (often called a CP44 for mobile use) which most event organisers and councils expect to see before letting a unit trade. Annual re-tests are commonly required.
How to set up an off-grid mobile catering unit (step by step)
The order matters — power needs to be in before you can test the water pump; the gas system needs to be in before the COMCAT engineer can certify it; certification needs to be in before you can legally trade. Below is the order most installs follow.
Step 1 — Map your appliances and loads
List every appliance with its electrical draw (watts) and gas rating (kW). Total the watts to size the generator or battery, and total the kW to size the gas system. Skipping this step is the single most common reason a setup runs out of power or gas on a busy day.
Step 2 — Install the power source
Mount the LPG generator outside the unit (never inside — exhaust gases) or fit the battery bank in a ventilated locker. Wire to a consumer unit with an RCD and breakers sized to each circuit. For battery setups, fit a pure sine wave inverter sized to the largest single load plus headroom.
Step 3 — Install the water system
Fix the fresh and waste tanks (1:1 capacity), plumb to taps and sinks, and fit the 12V pump with a pre-filter and pressure switch. Test by filling fresh, opening every tap in turn, and confirming waste drains cleanly to the tank.
Step 4 — Fit the propane system
Cylinder locker (vented to outside), 37mbar regulator, BS 3212 hose, isolators at each appliance, and a leak-detection bubble test before first fire-up. Cylinders are stored upright, never lying down, and never inside the kitchen area.
Step 5 — Book the COMCAT engineer
Book a Gas Safe engineer holding COMCAT 1, 2 and 3 to soundness-test the whole system and issue a Gas Safety Certificate. Some engineers will also commission your LPG coffee machine or fryer at the same visit.
Step 6 — Trial run before first trade
Run the unit for a full mock service before you take a first paying customer — same appliances on, same loads, full water cycle. Anything that fails on a quiet driveway will fail worse on a busy pitch.
What an off-grid setup costs in 2026
Setup costs vary widely with the size of the unit and the appliances inside, but the ranges below cover most builds:
| Component | Budget | Mid-range | High-end |
|---|---|---|---|
| LPG dual-fuel generator (3–8kW) | from £600 | £900–£1,400 | £1,800+ |
| Battery + inverter setup | from £450 | £900–£1,600 | £2,500+ |
| Fresh + waste tanks, pump, plumbing | from £250 | £400–£600 | £800+ |
| LPG water boiler (Fracino Atlantis Mini Gas) | from £1,149 | £1,149 | £1,149 |
| Propane regulator, hose, cylinders (×2) | from £150 | £200 | £250 |
| COMCAT gas safety inspection + certificate | from £180 | £220 | £260 |
Total budget build sits around £2,750. A mid-range build typically lands between £3,500 and £5,000. A high-end build with a 7kW+ generator, lithium battery backup and a multi-appliance gas system can exceed £7,000 before any cooking equipment is added. For a full startup cost breakdown including the unit itself, see the food trailer startup cost guide.
Common off-grid setup mistakes
- Undersizing the generator. Adding a fridge halfway through season then realising the 3kW unit trips every time the coffee machine fires the heating element. Size for peak load + 30% headroom from day one.
- Mismatched water capacity. A 45L fresh tank with a 25L waste tank fills the waste in half a service and forces an early pack-down. Match them 1:1.
- Cheap gas hose, no end date. A jubilee-clipped, undated hose fails the COMCAT inspection straight away. Buy BS 3212 hose with a printed date code, crimped ends only.
- No spare cylinder. Running out of propane mid-lunch with no changeover valve loses the rest of the day’s trade. Always carry two cylinders connected through a changeover.
- Skipping the trial run. First time everything runs together should not be in front of a queue of customers.
- Forgetting the gas safety certificate. Many events will not let an uncertified unit on the pitch — a £200 certificate protects a £15,000+ unit’s earning days.
Frequently asked questions
What does off-grid mean for mobile catering?
Off-grid means operating without any mains hookup — no plug-in electricity, no tap water, no piped natural gas. The unit carries its own power source (an LPG generator or a battery bank), its own fresh and waste water tanks, and its own propane cylinders. This is the standard configuration for almost every UK food van, catering trailer and event caterer because most pitches and festivals do not supply mains.
What size LPG generator do I need for a mobile catering trailer?
A 3kW propane generator covers a coffee trailer or a single-appliance food van. A 5–7kW generator handles a full catering trailer with fridge, lighting, LPG coffee machine electric element, and a water pump. A 7–12kW generator is needed if you run any appliance on full electric mode (electric fryer, electric griddle) or multiple high-draw items at once. Always size for peak load plus 30% headroom.
How much water do I need to carry for a day’s trading?
A small coffee or burger van typically needs 30–50 litres of fresh water for a full service. A full catering trailer with hand-wash, food prep and equipment cleaning typically needs 80–120 litres. Waste capacity should match fresh capacity 1:1 because that’s a common council requirement for the food hygiene rating inspection.
Can I run a mobile catering setup on batteries only?
Batteries alone work for low-power setups — a small fridge, lights, a card terminal and an LPG coffee machine running on gas with only the electronics drawing power. A 2,000Wh portable power station typically runs this kind of setup for a day. Batteries do not run high-wattage heating appliances (electric kettles, fryers on electric mode, water boilers on electric mode) for any useful length of time — for those, plan for an LPG generator or a hybrid setup.
Why propane and not butane for mobile catering?
Propane vaporises down to around -42°C; butane stops vaporising below about 2°C, which makes butane useless for any UK trading outside high summer — and unreliable even then on cold mornings. All commercial mobile catering appliances are rated for propane at 37mbar. Butane is a patio-heater and camping fuel, not a commercial mobile catering fuel.
Do I need a gas safety certificate to trade?
Most event organisers, councils and pitch landlords commonly require a current Gas Safety Certificate (often referred to as a CP44 for mobile use) issued by a Gas Safe engineer with the COMCAT mobile-catering qualifications. The certificate is typically renewed annually. Without it, expect to be refused entry at many events and to fail the food hygiene inspection.
How long does a 19kg propane cylinder last?
For a typical full day’s mobile catering with a propane coffee machine, fryer and water boiler running, expect to use roughly half a 19kg propane cylinder — so one 19kg cylinder commonly covers 2 days of trading. An LPG dual-fuel generator running off propane typically gets 8–14 hours from a 19kg cylinder depending on electrical load. Always carry a spare cylinder connected through a changeover valve.
What’s the typical total cost of an off-grid mobile catering setup?
A budget off-grid build (power + water + gas, not counting cooking equipment) starts from around £2,750. A mid-range build typically lands between £3,500 and £5,000, and a high-end build with a large LPG generator, lithium battery backup and a multi-appliance gas system can exceed £7,000. Add the unit itself (van or trailer) and the cooking equipment for the full startup figure — most caterers budget £15,000 to £25,000 all-in.