The toilet is one of the largest users of water in the home. Generally, modern toilets use less water. Toilets plumbed before 1993 will probably have a cistern that uses 9.5 litres of water per flush. Toilets installed after 1993 will probably have a 7.5 litre cistern. If your toilet was installed between 1983 and 1992 it may have a dual flush cistern.

Twyfords Flushwise