GARANTIA® 400L THERMO-KING compost bin

(3 customer reviews)

Original price was: £81.99.Current price is: £69.69. inc VAT

FREE Delivery by Tuesday, 23 July, 2024.

The Thermo King compost bin uses Thermolene technology to insulate your compost, speeding up the process and producing good quality compost faster. Your composter will arrive flat packed for quick assembly and is manufactured from 100% recycled plastic.

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Source: “The best compost bins in 2023”

This item: GARANTIA® 400L THERMO-KING compost bin
Original price was: £81.99.Current price is: £69.69. inc VAT
Original price was: £81.99.Current price is: £69.69. inc VAT
Original price was: £27.19.Current price is: £22.99. inc VAT
Do I need a soil fence? The soil fence prevents any rodents or small animals from burrowing under and into the composter. A soil fence isn’t needed but if you have any rodents or other small animals in your area then it might be something you will need to consider.
Length: 740mm - Width: 740mm - Height: 840mm
Product price
inc VAT
Additional options total:
inc VAT
Order total:
inc VAT
SKU: 626001 Brand:


  • Thermolene promotes fast composting due to optimal aeration system and thermo walls
  • Easier filling with two large filling hatches
  • Cover lock to regulate air circulation
  • Easy assembly without tools
  • Made from 100% recycled material (PP)

> Product Manual

Free Delivery

  • Delivery lead time is 4-6 working days on all orders however for our large underground rainwater tanks please allow 7-14 days.
  • Price is included to mainland UK, quotations for highlands and islands available on request.
  • We use a number of different hauliers and also deliver on our own vehicles.  We try to provide a tracking number for all orders but can accept customer enquiries by phone and email if you don’t receive a tracking number.
  • Decorative water butt orders will be palletised curbside deliveries.  The customer being home to accept the delivery is advised but not essential.


You have 30 calendar days to return an item from the date you received it. To be eligible for a return:

  • Your item must be unused and in the same condition that you received it.
  • Your item must be in the original packaging.
  • Your item needs to have a receipt or proof of purchase.


Once we receive your item, we will inspect it and notify you that we have received your returned item. We will immediately notify you of the status of your refund after inspecting the item. If your return is approved, we will initiate a refund to your credit card (or original method of

You will receive the credit within a certain amount of days, depending on your card issuer’s policies.

Additional information

Weight 13 kg
Dimensions Length 740 mm x Width 740 mm x Height 840 mm
Colour/ Material



3 Years


400 Litres

3 reviews for GARANTIA® 400L THERMO-KING compost bin

  1. Renata O’Donnell

    Bought a Thermo-King 400L + soil fence. Both delivered on time and easy to set up and get started. Great space in the composter without it taking up too much space in the garden. Would recommend

  2. Margaret Turner

    We bought a Thermo-King 400 litre composter and a soil fence – both were delivered timely and well wrapped. Would recommend to others.

  3. Nigel Miller

    I have two of these Garantia composters now. They are simple to assemble without the need for tools and works nicely. Would recommend to others.

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How do composters work?

Composters, also known as compost bins work through heat, moisture, and air; where the bacteria breaks down the carbons 0f garden and food waste. Compost is very good for plants and can encourage growth, so it is no surprise to see more and more people making their own compost rather than store-bought packs.

Simply put the food waste or garden waste (lawn trimmings etc) into the composter, and assuming the material is biodegradable, eventually, over time this will break down to create a nutrient-rich mulch. This can then be put onto plants and borders, to help encourage growth.

What size compost bins do you sell?

Garden Tech stocks 280, 300, 400, 450, 600, 900, and 1000 litre composters.

How do I remove the compost from my composter?

Our compost bins have a small, easy access door at the bottom to allow you to collect the compost.

What is a soil fence?

A soil fence composter barrier will prevent rodents and burrowing creatures from getting into your composter while allowing worms and micro organises to pass freely between your compost and the soil.

What size compost bin do I need?

The size of the composter that you require is determined by the volume of vegetable material to be composted. A 300-litre bin is ideal for beginners, but large families and avid gardeners may wish to go bigger.

Do you have replacement lids?

Garden Tech can offer replacement lids, if requested.

How many compost bins do I need?

Many customers prefer having two compost bins as it also gives you a place to store finished compost to use in the garden as and when needed.

What size should a compost bin be?

In general, bigger is better, but 3 feet by 3 feet (1000mm x 1000m) is a manageable size for most gardeners. The compost bin(s) should be placed in full sun, if possible – shade will of course reduce the temperature and slow down the composting process.

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