# Cassandra Hot Water Bottle, Ribbed One Side, 1.8 Litre, 5 Year Guarantee

Source: https://www.ranked10.co.uk/home/best-hot-water-bottle/cassandra-18l
Ranked #1 in "Best Hot Water Bottle 2026: What 2 Litres Means": https://www.ranked10.co.uk/home/best-hot-water-bottle

- Price: £5.49 (checked on Amazon UK on 2026-09-13)
- Amazon rating: 4.4 from 4,197 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0018LS1ZG?tag=ranked10-21

The Cassandra is a 1.8 litre natural rubber bottle for £5.49, rated 4.4 stars from 4,197 ratings, with a five-year manufacturer guarantee.\n\nIt takes first place because it is one of only two listings here that name the British Standard its rubber is made to, because it is the deepest sample in the ranking, and because it states 1.8 litres where almost every other listing rounds up to two.

## Specification

| Field | Value |
|---|---|
| Standard named | Exceeds BS1970/2012 |
| Capacity as listed | 1.8 litres |
| Guarantee | 5 years |
| Unit weight | 380 g |
| Surface | Ribbed on one side |
| Ratings | 4.4 from 4,197 |

## Questions people ask

**Why is it first?**

Because it names the British Standard its rubber meets, has the deepest sample here and costs £5.49.

**Is it really 1.8 litres?**

Yes: the title, the bullet and the dimensions all say 1.8, where most listings round up to two.

**What does BS 1970/2012 mean?**

It is the British Standard for rubber hot water bottles, covering the rubber and the markings.

**How long does the guarantee last?**

Five years, the longest offered on any bottle in this ranking.

**Will I get the colour shown?**

No: the listing says the colour received varies depending on stock.

**How many ratings does it have?**

4197 at the time of collection, averaging 4.4 stars, with 71 per cent five-star and 6 per cent one-star.