Get reliable gas hot water for your home with compact systems that heat fast and keep temperatures steady. This page covers the key choices so you can pick the right gas hot water unit, compare models, and order with the fittings your installer will expect.
Explore our full range of gas hot water options, from space-saving continuous flow to dependable storage tanks. Renovation Kingdom sources from renowned Australian brands and supports you with clear specs, fast delivery, and practical advice.
Why choose a gas hot water system
A gas hot water system gives you quick recovery, stable outlet temperatures, and strong performance in colder months. Continuous flow units heat on demand, so you do not store unused hot water. Storage tanks suit households that run long showers or fill baths. Both formats are proven, so the choice comes down to usage patterns, available space, and your gas supply.
Continuous flow vs storage
Continuous flow units mount neatly on a wall and deliver water at a set temperature. They suit homes where demand varies across the day. Look at the litres per minute rating and the minimum flow requirement if you use water-saving taps.
Storage systems hold a fixed volume of heated water ready to go. They are straightforward to install and service. Capacity matters, so choose a tank that matches peak use in the morning and evening.
Sizing your gas hot water heater
Right-sizing avoids cold surprises and wasted energy. Singles and couples usually match well with a 16 to 20 L/min continuous flow unit or a 90 to 135 litre tank. Families of three to four often need 20 to 26 L/min or a 160 to 250 litre tank. Larger households, two bathrooms used at once, or a large bath may push you to 26 to 32 L/min or 250 litres and above. Also think about incoming water temperature in your region and any overlap between showers, laundry, and kitchen use.
What to compare
Focus on flow rate or tank capacity first. Then check temperature control, minimum operating flow, gas star ratings, and warranty coverage on heat exchangers or tanks. Note the installation location. Outdoor units are simple to ventilate and service. Indoor models need the correct flue kit and clearances. If you want a neat installation, look at recess boxes or pipe covers listed with each gas hot water unit.
Running costs and performance
Well-matched systems keep bills predictable. Pick capacity for your peak times rather than the rare big day. Set a comfortable outlet temperature and stick with it. Fit water-saving shower heads, insulate exposed hot water lines, and keep valves in good condition. If you pick continuous flow, regular servicing of the burner and inlet filters supports efficient operation. For storage tanks, ask your plumber about anode inspection intervals based on your water quality.
Installation and compliance
Gas appliances must be installed by a licensed tradesperson. Sort the location first, confirm gas supply pressure and pipe sizing, and plan drain lines where the manufacturer specifies them. Bathroom outlets typically require a tempering valve to control delivery temperature. Ordering the right accessories with the unit helps avoid return visits.
Recommended accessories
Keep it simple. Most installs need a tempering valve, a compliant gas connector with isolation, pressure limiting where required, and pipe insulation for exposed runs. Continuous flow units may also need a flue kit or recess box depending on the location.
Head to Hot Water Unit Accessories to bundle the parts your plumber will ask for.
Three clear steps to the right unit
Pick the format that suits your space and habits, match the capacity to your busiest hour, then add the fittings in the same cart. You will have everything on site for a smooth install and a predictable handover.
Why buy from Renovation Kingdom
Renovation Kingdom is Australia’s leading supplier of high-quality bathroom products, with more than 50,000 items from trusted brands. Our gas hot water range covers compact apartments, busy family homes, and upgrade projects replacing tired electric tanks. Product pages list flow rates, capacity, efficiency ratings, and compatible kits so you can buy with confidence. If you need a hand, our team will help you match a gas hot water heater to your household and shortlist the fittings your plumber will ask for.
Maintenance made easy
Keep the area around outdoor units clear and check joints at seasonal changes. Record the model and serial number for parts and warranty claims. Service heat exchangers, burners, filters, and valves on the schedule in your manual. For storage, plan anode checks to protect the tank. Small habits like these keep your gas hot water system steady year after year.
Ready to compare
Start with continuous flow if you want compact, set-temperature showers on demand. Start with storage if you prefer a buffer of hot water for long use. Filter by flow or litres, choose indoor or outdoor models, then add your tempering valve and any mounting or flue kits. Your cart will contain a complete gas hot water unit setup ready for the installer.
Gas Hot Water Heat Units FAQs
What size gas hot water unit suits two bathrooms?
Most homes running two showers at once choose a 26 to 32 L/min continuous flow unit or a 250 litre storage tank. Check shower head flow rates and local inlet water temperature before you buy.
Is continuous flow cheaper to run than storage?
It can be. Continuous flow heats only when you use hot water, which cuts standby losses. Storage can work well for predictable peak times, especially with water-saving fixtures and good insulation.
Can I replace an electric tank with a gas hot water heater in the same spot?
Often yes, but a licensed installer must confirm gas supply, ventilation, clearances, and flueing. You may also need new valves and updated pipework.
Do I need a tempering valve?
Bathroom outlets in most states require controlled delivery temperatures for safety. A tempering valve mixes hot and cold to a set point and is commonly specified by plumbing rules.
How long will my system last?
Storage tanks typically run 7 to 12 years depending on water quality and maintenance. Continuous flow units often carry long heat-exchanger warranties when serviced on schedule.
What accessories should I order with my unit?
Plan for a tempering valve, compliant gas connector, pressure control where needed, and pipe insulation. For indoor continuous flow, add the correct flue kit. Recess boxes and covers give a clean finish outdoors.