How to choose a hot water system: what to actually consider

Buying a hot water system is one of those jobs people rush, usually because the old one has already died and there is no hot shower in the morning. That panic is exactly how homes end up with the wrong system: too small, expensive to run, or a type that never suited the house. Terry has fitted and replaced hundreds of systems across Berala and Western Sydney since 1986, and the same handful of factors decide the right choice every time.

Start with what your home is connected to

The first question is simple: do you have natural gas at the property? Most of Western Sydney does, and if the gas line is already there, a gas continuous flow system is usually the standout. It heats water on demand, never runs out, and costs little to run. If there is no gas and no easy way to bring it in, the realistic choice is between electric storage and a heat pump. There is no point pricing a gas unit for a home that would need a costly new gas connection to use it.

Size it to the household and the morning peak

The number that catches people out is not how much hot water they use in a day, it is how much they use at once. Two showers running while the dishwasher fills is the real test. For gas continuous flow, Terry sizes by flow rate: roughly 16 to 20 litres a minute for a one-bathroom home, 24 to 26 for two bathrooms, and 32 for three or more. For tanks it is litres of storage: 125 to 170L suits one or two people, 250 to 315L a family of three or four, and 315 to 400L for five plus. Undersize it and someone always ends up with a cold rinse.

Weigh up-front cost against running cost

Cheapest to buy is rarely cheapest to own. Here is the honest trade-off:

• Electric storage: lowest to fit, around $1,500 to $2,500, but dear to run on a normal tariff. On off-peak or controlled load it becomes competitive.
• Gas continuous flow: around $1,900 to $3,500 fitted, cheap to run, long lived at 15 to 20 years.
• Gas storage: a simple like-for-like swap, around $1,800 to $3,000.
• Heat pump: around $3,500 to $5,500 before rebate, but the cheapest of all to run, using about a third of the power of a standard electric element.
• Solar: highest up-front at around $4,000 to $7,000, lowest bills long term, but it needs north-facing roof space.

Then factor in space, rebates, warranty and parts

A few practical things decide it in the end. Continuous flow units hang on an outside wall and free up floor space. Heat pumps and solar need room and the right aspect, and a heat pump wants open air around it because it draws heat from the surrounding air. Rebates matter too: swapping an old electric or gas system for a heat pump in NSW can combine federal certificates with the state incentive to knock roughly $1,000 to $2,500 off the price, applied as an up-front discount through accredited suppliers. Terry will tell you honestly whether a heat pump actually stacks up for your place, or whether a straight gas swap makes more sense.

Last, look at warranty and parts availability. A cheap import with a long warranty is worth little if nobody in Sydney stocks the parts. Terry rates Rheem and Rinnai highly partly because they have the widest local parts network, which means a faster fix years down the track rather than a week waiting on a component.

Hot water and gas work has to be done by a licensed person, so this is not a DIY job. If you want a straight recommendation based on your home rather than whatever is on special, call Terry on 0415 274 542 and he will quote a fixed price before any work starts.