Water tank size calculator
Work out the water tank capacity your household needs based on occupants and usage. This helps you avoid buying a tank that is too small or oversized.
This is the minimum tank size to cover daily usage plus reserve; round up to the nearest common tank size (e.g. 500L, 1000L, 1500L).
Compare actual quotes for this projectThis is a general guide; a plumber can confirm the right tank size and pump pairing for your home.
When you submit an enquiry through our contact forms, we may pass it to partner providers who can do the work, and we may receive a referral fee. Our rankings and scores are based only on our published scoring method and are never affected by referral fees.
Get quotes from water tank and pump specialists
Ranked by our published rubric from recent Google reviews, weighted by relevance to this service (the same order as the category page).
BP Plumbing klGet a quote4.9(120) 90
Get a quote
Sumon Electrical & Hardware TradingGet a quote4.9(89) 89
Mizu SolutionsGet a quote4.8(458) 89
Get a quote