Tankless vs Tank Water Heater: Which Is Right for You?
Tankless and storage both make hot water, but they suit different homes and budgets. This comparison weights what actually matters: purchase and install cost, running cost, lifespan, and space.
Storage (tank)
Cheaper to buy and simple to replace. It stores hot water ready to use but loses some heat over time and runs out under heavy demand. Typical lifespan 8–12 years.
Tankless (continuous-flow)
Pricier up front and often needs larger gas/electric supply, but never runs out, is more energy-efficient over time, and lasts 15–20 years. It also frees up wall or floor space.
Where each wins
For a smaller household that wants the lowest upfront cost, a tank is a sensible pick. For a busy household, a house tight on space, or a long-term owner, tankless usually pays off over its life. Your energy tariff and gas availability matter too.
Make the call
List your household size, how much hot water you use at peak (showers, dishwasher, laundry), your fuel type, and how long you'll stay. Then get a written quote for both options so the install difference is clear, not guessed.
Common questions
Which is cheaper to run?
Tankless is generally more energy-efficient and cheaper to run because it doesn't keep heating stored water — but the unit and install cost more up front.
Does tankless need special plumbing?
Often a larger gas line or electrical circuit, and sometimes upgraded venting. That's a big part of why installation is more involved.
How big a tank do I need?
A family of four typically wants a 170L+ storage unit. A tankless unit is sized by flow rate, not storage volume.
Need a licensed plumber in Sydney?
Tell us what's going on and a local plumber will get back to you fast.
Get my free quoteGet a free quote
Tell us what you need and a local, licensed plumber in Sydney will call you back. No obligation.
- Local, licensed plumbers
- Fast response — incl. emergencies
- Free quote, you choose who to hire