Quick Answer
A commercial soup kettle is a countertop wet well that holds soup, sauces, or beans at 63°C or above for service. Standard 10 litre units cost £74–£115, and heavier commercial models run to about £287. A soup kettle holds food — it cannot legally or practically be used to reheat it.
Caterzone supplies commercial soup kettles and countertop wet wells to UK cafés, delis, garden centres, farm shops, and takeaways, and the soup kettle earns its keep by turning a low-cost menu item into a high-margin one that sells itself from the counter. It is also the piece of equipment most often used incorrectly, in a way that would fail an environmental health inspection.
This guide covers how soup kettles work, wet versus dry operation, the 63°C hot-holding rule and the two-hour allowance, sizing against your covers, running costs, and the maintenance that determines whether a kettle lasts one season or five years. Browse the soup kettle range as you read.
What is a soup kettle and how does it work?
A soup kettle is a countertop hot-holding unit: an outer body containing a heating element, an inner stainless steel pot — typically 10 litres — and a hinged or lift-off lid, usually with a ladle notch. A thermostat holds the contents at a set serving temperature, generally adjustable through a range up to around 90°C or above.
Most soup kettles are designed for wet operation. You add a small quantity of water to the well between the outer body and the inner pot, and the element heats that water, which in turn heats the pot. The water jacket is the point: it spreads heat evenly around the pot and prevents the direct, localised heat that would scorch a thick soup or a bean dish onto the base.
Dry operation — running the element with no water in the well — is faster to heat and avoids topping up, but it heats the pot from the base only and creates hot spots. Some units permit it; many do not, and running a wet-well kettle dry can damage the element. Check the manual, because this is the most common way a cheap soup kettle is destroyed in its first month.
Typical power is modest, around 400W to 500W for a 10 litre unit, which reflects the job: holding food at temperature, not heating it from cold.
Can you reheat soup in a soup kettle?
No — and this is the single most important point in this guide. A soup kettle is a hot-holding appliance. It does not have the power to bring a large volume of cold or ambient food up through the danger zone quickly, and food that creeps slowly from fridge temperature to serving temperature spends hours in the range where bacteria multiply.
The correct sequence is: reheat the soup properly on the hob, in a combi oven, or in a bratt pan until it reaches at least 63°C throughout — 75°C is the standard best-practice reheat target in England, Wales, and Northern Ireland, and 82°C in Scotland — then transfer it, piping hot, into a soup kettle that has already been preheated.
Preheating the kettle matters. Pouring 63°C soup into a cold pot drops the temperature immediately, and the kettle's small element will take a long time to recover. Switch the unit on at least 30 minutes before service with water in the well, then fill it.
Reheat food once only. Soup that has been held, cooled, and reheated repeatedly is both a food safety problem and, frankly, no longer worth serving.
What temperature must a soup kettle hold food at?
UK food hygiene law requires hot food to be held at 63°C or above. Set the thermostat so that the actual measured core temperature of the soup sits comfortably above that — most operators run 70°C to 80°C, which gives working margin for lid-lifting, ladling, and top-ups during service.
There is a limited legal flexibility: food may be held below 63°C for a single period of up to two hours, after which it must be served, reheated to 63°C or above, or thrown away. That allowance exists for practical situations like a display counter or an outdoor stall, and it is not a licence to run a kettle at 55°C all afternoon.
Check with a probe, not the dial. The thermostat measures the well or the element, not the soup, and a kettle that has just been topped up or has the lid propped open can read fine on the dial while the product sits below 63°C. Probe the centre of the pot at the start of service and at intervals through it, sanitise the probe between products, and log the readings in your HACCP diary.
Stir before probing. A soup kettle heats from the outside in, and an unstirred thick soup can be 75°C at the wall and well under 63°C in the middle.
Soup kettle comparison
| Model type | Capacity | Best for | Guide price |
|---|---|---|---|
| Entry 10 litre kettle | 10L, wet well | Cafés, seasonal soup service | £73.95 |
| Standard 10 litre kettle | 10L, stainless pot and lid | Delis, farm shops, garden centres | £94.95 |
| Heavier 10 litre kettle | 10L, thicker body, sauce and beans | Takeaways, daily service | £114.95 |
| Commercial branded kettle | Heavy duty build | All-day service, canteens | £286.90 |
| Multi-pot bain marie | 2–4 GN pans | Multiple dishes on one counter | From £150 |
The pattern is straightforward: capacity is broadly standardised at 10 litres, so what you are paying for above about £100 is build quality — gauge of stainless, thermostat accuracy, lid hinge, and element life.
Soup kettle or bain marie — which should you buy?
Buy a soup kettle if you serve one or two liquid products, want them visible on the counter, and need customers to see the item to sell it. The round pot, the lid, and the ladle are part of the merchandising, and a soup kettle takes up very little counter width.
Buy a bain marie if you hold several different dishes, or if you hold food in gastronorm pans that come straight from the kitchen. A four-pot bain marie holds a spread across a carvery or a takeaway counter, and pans can be swapped without decanting.
The two are not really competitors — many UK counters run both, with a bain marie holding the main service and a soup kettle handling the soup of the day. A soup kettle is also considerably cheaper to buy and to run, so for a café adding a single winter soup line it is the obvious starting point.
Where a soup kettle wins clearly is on liquid products: it holds the volume of a large pot in a small footprint, keeps a skin from forming under a closed lid, and looks like what it is. Where a bain marie wins is variety.
Sizing, running cost, and maintenance
A 10 litre kettle is the standard size and covers most UK operations. It holds roughly 30 to 35 servings at 300ml, which suits a café or deli selling soup as one line among many. If you sell soup as a main event — a farm shop in winter, a canteen, a market stall — run two kettles with different soups rather than one large one, because two flavours sell substantially more than one and give you redundancy if an element fails at 11am on a Saturday.
Running cost is low. A 400W to 500W kettle drawing around 0.45kW while heating and cycling roughly half the time over an eight-hour day uses about 1.8kWh. At around 25p per kWh that is roughly 45p a day, or under £3 a week. It is one of the cheapest pieces of equipment to run in a commercial kitchen.
Maintenance comes down to three habits. Keep water in the well when the manual requires it, and top it up during service — a dry well on a wet-operation kettle burns out elements and is the leading cause of failure. Descale the well regularly if you are in a hard water area, because scale insulates the element from the water and slowly kills it. And empty, wash, and sanitise the pot and lid every day; never leave product in the kettle overnight, whether the unit is on or off.
PAT test the kettle annually with the rest of your plug-connected equipment, check that the flex has not been dragged across a hot surface, and replace the lid seal or hinge when it stops sitting square — a lid that does not close properly costs you both temperature and evaporation all day.
Frequently asked questions
How much does a commercial soup kettle cost in the UK?
UK soup kettles start at around £74 for a basic 10 litre wet-well unit, with standard commercial models at £95 to £115 and heavier branded units around £287. Capacity is broadly standard at 10 litres, so the price difference reflects build quality, thermostat accuracy, and element life rather than how much soup the unit holds.
Do you put water in a soup kettle?
Most soup kettles are wet-well units and require a small amount of water in the well between the outer body and the inner pot, as specified in the manual. The water jacket spreads heat evenly and stops thick soups catching on the base. Running a wet-well kettle dry commonly destroys the element, so top the water up during service.
What temperature should a soup kettle be set to?
Set the kettle so the soup itself measures above the UK legal minimum of 63°C — in practice a setting that holds 70°C to 80°C gives useful margin. Check with a sanitised probe in the centre of the pot after stirring, not by reading the dial, and record the temperature in your HACCP log during service.
Can you cook or reheat soup in a soup kettle?
No. A soup kettle holds food at temperature; it does not have the power to heat food safely from cold, and slow warming leaves food in the bacterial growth range for hours. Reheat on a hob or in a combi oven to at least 75°C in England, Wales, and Northern Ireland, or 82°C in Scotland, then transfer to a preheated kettle.
How long can soup be held in a soup kettle?
Soup held continuously at 63°C or above may be kept through service, but quality falls after about four hours and thick soups reduce and catch. UK rules permit a single period of up to two hours below 63°C, after which the food must be served, reheated to 63°C or above, or discarded. Never carry soup over to the next day in the kettle.
How do you clean a soup kettle?
Switch off, unplug, and let the unit cool. Remove the pot and lid, wash and sanitise them as normal food-contact equipment, then empty the water well and wipe it out. Descale the well periodically in hard water areas. Never immerse the outer body or the element in water, and dry everything before reassembly.
Where to buy soup kettles in the UK
Caterzone stocks countertop soup kettles and wet-well food warmers for UK cafés, delis, and takeaways. Browse the soup kettle collection, or start with the 10 litre soup kettle and sauce pot warmer at £73.95 for seasonal service, choose the standard 10 litre soup kettle at £94.95 for daily use, and for heavier all-day service specify the heavier 10 litre stainless soup and bean kettle at £114.95 or the Combisteel commercial soup kettle at £286.90.
To hold a wider spread on the same counter, read our commercial bain marie buyer's guide and our hot holding cabinet guide. For advice on holding equipment for your counter, call Caterzone on +44 7787 069044 or email info@thecaterzone.co.uk.
