Billyboil Thermal Cooker 4.5L

111 reviews

Sale price$169.00 Regular price$249.00
7 in Stock   ✓ Next Day Dispatch

Save Time & Energy While You Cook

The Billyboil uses no energy after an initial heat-up on your existing stovetop. It cooks delicious meals for up to twelve hours using retained heat.

It's an ideal solution for everyday cooking or when you're travelling. Here's why:

  • It saves time because you can leave your meal to cook unattended while you do something else.
  • It saves money using up to 80% less energy than conventional cooking methods.
  • It's vacuum insulated, which means it can keep food cooking between 60˚C and 100˚C for up to 12 hours.
  • It's safe and easy to use, with a carry handle and lockable lid for travel.

Billyboil Thermal Cooker Components

Components of the Billyboil insulated thermal cooker.

How Does the Billyboil Work?

The Billyboil has two main parts: a stainless steel 'inner pot' and a vacuum-insulated 'outer pot'. Here's how easy it is to use:

  1. Use the inner pot like usual: bring your food to a boil, or cook as your recipe requires.
  2. Once the food is heated, switch off your stove, place the inner pot inside the outer pot, and close the lid. The Billyboil will continue to cook the food using retained thermal energy in the already heated-up food.
  3. Remove the inner pot when the cooking time has elapsed or when you're ready to eat (up to 12 hours later).

Billyboil Thermal Cooking Process

The Billyboil is easy to use on any existing stovetop.

Specifications - Billyboil Thermal Cooker 4.5L

Power Usage Nil
Components Double-wall vacuum insulated 'outer pot' with carry handle; stainless steel 'inner pot' with handle and removable silicone handle cover; printed instructions
Capacity 4.5 litres (inner pot) - see our smaller Billyboil
Compatibility Electric, gas, induction, and camp stoves
Dimensions Outer pot: 25cm high by 25cm wide
Inner pot: 17.5cm high by 20cm wide
Weight 3.1kg
Materials Food-grade stainless steel type 304 inner and outer pot. Outer pot has a plastic (polypropylene) handle and framing. Inner pot base has an aluminium core for induction cooktop compatibility with stainless steel top and bottom layers.
Product Identifiers Billy Boil 4.5L Thermal Cooker, 9398348333487 (Barcode)
Further Details Instructions (PDF)
Warranty 2 Years

Frequently Asked Questions

How many people is it suited for?

This thermal cooker has an internal capacity of about 4.5 litres. It suits cooking for four or more people. You can also use it for cooking in larger batches (for a smaller number of people) to make extra meals for later.

If you prefer something a bit smaller, see our compact 3L thermal cooker.

Some of our customers buy one of each size for large groups or for cooking two types of food (for example, rice in one and a curry in the other).

What recipes do you suggest?

Any recipe designed for extended simmering, slow cooking, or one-pot cooking is ideal for the Billyboil.

In other words, you probably already have a stack of suitable recipes. We have more guidance in the instruction manual (in the specs table above) and this thermal cooker recipe guide.

Is it compatible with electric induction stovetops?

Yes. It has a thick base which is appropriate for induction stovetops. It even works on camp stoves, butane stoves, alcohol stoves, etc. It is, of course, also suitable for regular electric, natural gas, and LPG stoves.

How should I clean the Billyboil?

You can clean the Billyboil like any stainless steel cookware. Use warm soapy water to clean the inner pot. A quick wipe-down with a damp cloth is usually sufficient for the outer pot. Use a stainless steel cleaner or cleaning paste, like 'Gumption', for any stubborn marks. Avoid using steel wool or harsh abrasives as they may scratch the stainless steel.

Customer Reviews

Based on 111 reviews
Bringing lots of joy to our kitchen

I'm happy to review this product! We can now use less energy and save money on gas. Also we can cook on the fire (rocket stove and indoor wood stove) with much more ease because we can cook for a short time while the fire is hot and then pack the Billy boil away and let it finish cooking by itself, long after the fire has cooled down. + the meal is hot and ready to serve when we are ready to eat. If we aren't cooking anything we can just heat water on the fire and put it away to use the next day for dish-washing or cooking! (it was about 70 degrees C after 10-11 hours) It is well built with little design details that make it easy to use like the handle that stays up away from the heat while cooking and then folds away snugly later. Also the pots are narrow and tall making it easy to fit two at the same time on our small wood stove. Risotto worked well and I only had to bring it to boil, and then pack away, veggies still have their texture and have flavor all the way through. Stewed fruit was delicious, each piece of fruit still has it's shape unlike when boiled on the stove and spices and flavor all the way through the fruit. Yum. We'll be using this for years to come. Thanks

Ed Brandon
Thermal Cooker 4.5L great little cooker guys


Roger Turner
All good thank you.

All good thank you.


Great product

Thi Le

Billyboil Thermal Cooker 4.5L

Judith Watts
Billy boil

Used it a couple of times. Great to come inside at night and have meal ready to eat. Was hoping it was more rounded like a slow cooker.But still works good. A recipe book would help people with meals

Thomas Buckham

Met all expectations

Sarah Ransom
Love it

Does exactly as advertised but also good for transporting hot food (to old and distant neighbours) very happy thankyou

Lisa D'arne Harris
Awesome Billy

We love cooking in our billy and it’s even better having a small one for rice and a large one for cooking curry


I just recieved my Billyboil 4.5 L yesterday ( I'm in the U.S.A) and I want to say how incredibly impressed I am. I made a lemon chickpea veggie soup. Now granted there was no meat in it. It was entirely vegan. I layered the flavors of cooking the onion, spices, celery, and carrots. Then I added dry unsoaked chickpeas. I brought to 212 degrees Fahrenheit and then simmered for about a half hour because ingot distracted. My pot was about 90% full. I put it in the outer pot at 5 p.m. I used a thermometer to test the temp and it was 211 degrees going in the outer pot. I got busy and distracted and didn't get back into the Kitchen until 3 a.m. I opened the thermal cooker up and immediately tested the temperature and it was 173.4 degrees! 10 hours later! I am SO impressed! This will mean I won't have reheat dinner when I get home after work! I will do some more cooking next week and see how the temperature holds with a bulkier soup.

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