GAS HOT WATER SYSTEMS

ABOUT GAS HOT WATER
Gas hot water systems burn gas to heat water which generates far fewer greenhouse gases than using electricity from the grid. Gas systems can come in either a gas storage water heater, or a continuous flow/instantaneous water heater.
Gas storage hot water systems will usually have a continuously burning pilot flame which ignites a burner to heat the water in the tank when it is required. Usually the unit will have a thermostat which tells the system to heat the water in the tank if it drops below a specified temperature.
A continuous flow or instantaneous gas hot water system doesn’t have a storage tank as it simply heats the water via a gas burner which is activated when a hot water tap is turned on in the house. It only heats the amount of water that is required instead of continuously heating a full tank which means they can have large energy and cost savings. More importantly, what this means for the consumer is that with a continuous flow system you will never run out of hot water.
For a detailed explanation on how all types of gas hot water systems work see here: https://www.yourhome.gov.au/energy/hot-water-service
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PROS AND CONS
PROS
- Between 5-6 star energy efficient
- High system warranties
- Low maintenance
- Generally lower purchase cost
- Available in LPG or natural gas
- Optional temperature control (continuous flow only)
- Continuous, never-ending hot water (continuous flow only)
- Slim line and wall mounted (continuous flow only)
- Hot water during a power outage (gas storage only)
CONS
- Mid-range usage costs
- Strict install requirements
- Lower water pressure in colder temperatures (continuous flow only)
- Reliant on electric ignition (continuous flow only)
- Don’t work well with water saving shower heads (continuous flow only)
- Require a constant pilot light which can be blown out (gas storage only)
OUR RECOMMENDATIONS
If you’re looking at upgrading your current gas system or connecting for the first time, we recommend installing gas continuous flow. With higher system warranties, 6 star+ energy rating & optional temperature control, this style system can suit the largest or smallest of families, only heating the water that you use.
Love a long shower? Never do you have to worry about running out or fluctuations in temperature as the water is heated as it flows through the system.
Temperature control provides safety & comfort to those with young kids and also saves on water & gas usage. Set your controller anywhere from 37 up to 50 degrees without the need of turning on a cold tap.

CHECK OUT OUR LATEST GAS HOT WATER DEALS

Not connected to gas? Connect through us and receive over $750* in rebates off of the supply and install of new Rinnai Infinity 16 gas continuous flow hot water system thanks to Australian Gas Networks!!*
Already have a gas system that isn’t working like it used to? Get a new Rinnai Infinity 16 from $1,245 supplied and installed inc GST.
Terms & Conditions
Only available in the greater Adelaide area subject to availability. Offers valid until 30th November 2025 unless Scheme or offer is changed prior.
*Available to existing households replacing a continuous flow gas hot water system. Installation cost excludes external weatherproof power point & subject to onsite inspection. ^Visit rinnai.com.au for full warranty terms and conditions.
All installation quotes are subject to site inspection. Customers must contact HOT WATER COM AU to find out if they are eligible for the offer based on their property’s existing set-up. Rebates vary based on the property’s energy connection status, location (based on climate zones) and model of the new system being installed. Other tank sizes, fuel types and brands are available upon request. Offer only available on supply and installation of the system by HOT WATER COM AU or their accredited representative; all REPS credits created under these offers must be assigned to MAC Trade Service’s (MACTS) obliged Energy Retailer partner.
INTERESTED IN A GAS HOT WATER SYSTEM?
Get in touch with our expert sales team for a free, no-obligation quote. Still unsure? Give us a call with any questions you may have and our team will get you into the best suited system for you and your home.
Interest free payment plans available on all new installations


LATEST REVIEWS
Now we have heaps of hot water and our electricity is only $0.06 cents KWh as we have solar panels and a battery.
Congrats!
Daryl
Email contact was quick and thorough
Attending crew were very polite, punctual and so tidy. Job was completed quickly and hot water that night...
After being messed around by our failed hot water system company, I turned to Hotwater.com.au, they were a pleasure to do business with and made sure the new install was working and provided some handy hints. Every interaction was easy and smooth... highly recommend
They are always ready to help even when we had an initial issue with the Hot water heater.
This was definitely NOT their fault but they helped us solve the issue anyway.
Their communication and replies to questions are superb .
Any business is happy to take your money but the quality of the business is what they do when there is an issue and this is the gold standard for customer service.
This business passes that test with flying colours and I could not recommend them more highly.
Emphatically recommend.
From the very start of my enquiry, with Natika, who not only answered questions about Thermann x Split Heat Pump unit, but supplied additional info as well, right through to the installation, which was carried out smoothly, was excellent.
The unit has been installed now for over a week and has proved to be great, using solar power to heat our water supply. Can’t recommend the unit more and also the work carried out by Hotwater.com. Thanks a heap guys.
As I was at work and had no time to sort this out I decided to proceed. Thankfully, it was close of business and installation was to be done the following day.
When I went home, I searched online and came across these guys in a facebook ad. Called them early in the morning, spoke to Nitika and could not believe the quote of $1,295.00 supplied and installed SAME DAY, EXACT SAME RINNAI B20 MODEL! Absolutely no dramas, no call out fees, nothing! These guys saved me $500.00. I wish all plumbers were like this open and upfront quotes, no bull shit. Unluckily for me, Purity plumbing and Gas proceeded to charge me $165.00 for call out and quote. Thanks to these guys, I still saved $335.00 🙏🙌❤️
Replaced our old solar hotwater service with a reclaim heat pump. What can I say but Wow!!
The service from the start was brilliant and the heat pump beats the solar hot water system hands down. No more boosting on cloudy days at night as the Solar panels on a cloudy/rainy day produce more than enough energy to keep the water hot. My power bill has gone down.
Again a big thank you to the team at Hotwater.com.au
These guys are fast and do everything, electrical, plumbing etc.
Highly recommend.
The lads did an amazing job working efficiently and thoroughly
Patrick and Sam did an absolutely fantastic job replacing my old hot water system with a brand-new one. From start to finish, they were professional, efficient, and incredibly knowledgeable. They arrived on time, explained everything clearly, and worked diligently to ensure the installation was done to the highest standard.
Not only did they complete the job quickly, but they also left everything clean and tidy, which I really appreciated. Their friendly attitude and attention to detail made the whole process smooth and stress-free.
If you’re looking for reliable and skilled professionals, I highly recommend Patrick and Sam. Thanks again for the excellent work!
Cheers, Greg
Colin Mason
Absolutely will use again, and highly recommend for all.
Efficient, extremely tidy, courteous - and explained the operation of the new Water Heater clearly and in fine detail. We are very pleased.
They were professional throughout the whole process.
Very very competitive on price (half of our local plumber), quote to install was very fast, and quality job on install.
We would definitely recommend their services.
Excellent, highly recommended.
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