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
Get in touch for a free quote
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.
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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
The best price for heat pump system, and great products, hands down. Fabulous customer service and follow ups.
Response from the owner:Thanks so much Christopher! We’re big believers in looking after people before and after install, so really happy to hear that came through for you. Have a lovely weekend!
I recently had my hot water system replaced as brown water was coming out of the tap for a few weeks. The service provided by hotwater was excellent. From the time I made the inquiry to when the job was completed was done within a couple of weeks. I was very impressed!
Response from the owner:So glad we could help sort that out quickly Gigi, no one should have to put up with brown water for long! Thanks for your lovely feedback 😊
Installed a IStore 270L through these guys presale service excellent as I asked lots of questions, the installation crew arrived on time neat and tidy install no problems and Hotwater.com employ all thier installers no subcontractors which I prefer.
Now we have heaps of hot water and our electricity is only $0.06 cents KWh as we have solar panels and a battery.
Now we have heaps of hot water and our electricity is only $0.06 cents KWh as we have solar panels and a battery.
Response from the owner:Love to hear this! We’re always happy to answer questions, and it’s great knowing your setup is now running efficiently and saving you money too. Thanks for taking the time to leave such a wonderful review Geoff!
Customer service for quoting, communication and installation of a new HWS has been excellent. Bonus - their prices are are good too
Response from the owner:Thanks so much Rod! We’re glad to hear everything went smoothly, and we’ll always take a bonus point for pricing too 😊
Helpful and accommodating staff with prompt answers to questions
Response from the owner:Hi Julie, thanks for your kind review! We’re always happy to help and it’s great to know you felt supported throughout the process. Enjoy your weekend!
Very happy with installation of Aquatech heatpump. Hot water pipes are well insulated. Left the work tidy. Thanks.
Response from the owner:Thanks for taking the time to leave such a lovely review, Craig. We're so happy hearing you are satisfied with our work. Please let us know if there's ever anything else we can assist with :)
HotWater.com.au supplied and installed a 270L iStore Heat Pump for me recently. Communication from Natika and on site service were fantastic from initial contact to final checks. I recommend them unreservedly.
Response from the owner:Thanks for your wonderful review! We're so pleased you had a great experience from start to finish, and Natika will be thrilled to hear your kind words. Have a lovely weekend!
very happy with the I store the staff was quite friendly and the technicians were good and I highly recommend them
Response from the owner:Thanks so much for the lovely feedback Darryl! We're really glad to hear you were happy with the iStore and that our team made a great impression. We truly appreciate the recommendation!
Very happy. Best price, friendly staff. Highly recommend.
Response from the owner:Thanks Melissa! Glad to hear you're happy with the install, and we appreciate the lovely review. Have a great week! :)
Excellent service, price and communication throughout the process.
Response from the owner:We’re so pleased you’re happy with our service—it was a pleasure assisting you with your new system
job well done
Response from the owner:Thank you for taking the time to leave a review Rob. Have a lovely week!
Very happy with the installation of our new heat pump - all seemed to go very smoothly. A very minor omission was removing the rust on the cement from the old one.
Response from the owner:Hi Anne, thank you for the feedback. We have passed this on to our install team, and we appreciate the kind words
Just had new system installed. Done efficienctly.
Response from the owner:Glad to hear that everything went smoothly. Thank you for taking the time to leave a review David!"
Nice fellows who installed the system & plenty of hot water on tap. Fair pricing & punctual.
Congrats!
Daryl
Congrats!
Daryl
Response from the owner:Thank you so much for your kind words! We're glad to hear you were happy with the installation team and are enjoying plenty of hot water 😊 have a wonderful weekend!
So glad I made the choice to use Hotwater.com.au. (Istore heat pump 270l)
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
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
Response from the owner:Thank you so much for the fantastic review! That's wonderful to hear and I'm so glad we could help 😊 hope you have a lovely weekend!
This business is exceptionally helpful, honest,polite and friendly.
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.
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.
Response from the owner:Thank you so much for your incredibly kind and thoughtful review. We truly appreciate it, and we're always happy & here to help! 😊
Recently had a heat pump hot water unit installed by hotwater.com.au, quick turnaround and very fast getting back to you, very happy with them and would recommend
Response from the owner:Amazing to hear, thanks Brad! We hope you have a lovely rest of the week 😊
The prompt courteous service and advice was exceptional. Prices were very reasonable too. Would highly recommend hot water.com.au!
Response from the owner:It’s great to hear that everything went smoothly. Thank you for your trust and for letting others know about your experience, Daphne!
Quick and efficient with competitive price, everyone was friendly, easy to book in, chat to and pay :)
Response from the owner:Thanks a ton for your kind words Michelle! We’re grateful for the opportunity to help and happy you’re pleased with the results.
Great experience with Hotwater.com
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.
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.
Response from the owner:Hi Leonne and Andy, we really appreciate you taking the time to share your experience. So happy to know you’re enjoying the new system, thanks again!
They put in an iStore heat pump. Easy to communicate with and installed cleanly! Will go to again if needed
Response from the owner:Hi Christopher, thanks so much for the lovely review! We’re thrilled everything is working well and that you’re pleased with the service.
Hot water unit broke down and Ray white called a plumber. Purity plumbing and gas comes over and provides a quote for $1,800.00 to fix and install.
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 🙏🙌❤️
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 🙏🙌❤️
Response from the owner:Thank you so much for your amazing review! It was a pleasure helping you with your hot water system. If you ever need us again, we’re just a call away!
Service was excellent. Replaced our hot water heater the next day after my initial enquiry, fast and efficient work and very friendly. Would definitely recommend their company.
Response from the owner:Thank you Anne for leaving us such a lovely review, we hope you have a wonderful rest of the week 😊
Very happy we chose Hotwater.com.au to install our hot water unit. Professional, honest and friendly team doing a great job. Special thanks to Mark, the gas fitter plumber .
Response from the owner:Thank you Anna for your lovely review, that's wonderful to hear! 😊 Have a great rest of the week!
Thank you to the team at Hotwater.com.au
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
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
Response from the owner:Thank you so much Paul , amazing to hear 😊 we really appreciate you leaving us such a lovely review. Have a wonderful rest of the week
Unbelievable fast service. From gas Hot water tank to heat pump electric hot water within 6 hours of my phone call.
These guys are fast and do everything, electrical, plumbing etc.
Highly recommend.
These guys are fast and do everything, electrical, plumbing etc.
Highly recommend.
Response from the owner:Thank you Brad for the glowing review, it was our pleasure! 😊 we hope you have a lovely long weekend!
Very happy with the installation of my solar hot water system
The lads did an amazing job working efficiently and thoroughly
The lads did an amazing job working efficiently and thoroughly
Response from the owner:Thank you so much Rebecca for leaving us a glowing review, we really appreciate it 😊 have a great rest of the week!
Fast and friendly service. No mucking around. Quick and easy to deal with.
Response from the owner:Thank you so much, it was our pleasure to help! 😊
Thank you Patrick & Sam.
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
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
Response from the owner:Thank you so much for your wonderful feedback! We’re thrilled to hear and it’s great to know that they made the process smooth and stress-free. I’ll be sure to pass along your kind words to them.
Your recommendation means a lot to us, and we really appreciate you taking the time to share! 😊
GMH Hotwater were very prompt and efficient in replacing our old gas hot water heater with a new heat pump. The installers did a great job.
Response from the owner:Thank you so much Peter, that's wonderful to hear! I'll be sure to pass this onto the team. Have a great rest of the week 😊
Just had the easiest and most efficient HWS changeover. Cold shower one day and hot shower the next. And with good advice to suit my situation with the relative rebates. Installation gang were also friendly and professional.
Response from the owner:Thank you so much Lee, that's wonderful to hear! I'll be sure to let the team know, they'll be thrilled 😊
Good price, great service. Got an Aquatech Rapid 6X installed. It was required urgently and the trades who came were considerate , polite and efficient...great lads.
Response from the owner:Thank you for your kind review! We’re so glad to hear that you’re happy with our service. If you ever need anything in the future, don’t hesitate to reach out!
We have had a heat pump water heater installed today. The quote (initial recommendation via Solar Quotes website) was provided promptly, as well as further answers to questions, including options and prices. The installation was done professionally, thanks to Cory and Braeden, and the unit is working fine. No reservations in dealing with Hotwater.com.au at all.
Response from the owner:Hi Roger, we truly appreciate your five-star review! We'll pass on your kind words to Corey and Braeden :)
Great service and good price. I couldn't fault the team from start to finish. Very minor issue with a small scratch on the timer cover - which the manufacturer or supplier should really have rectified. Hence why 1 less star.
Response from the owner:Thank you for your kind words! We truly appreciate your understanding regarding the scratch on the timer cover, and I've passed on this feedback along to the manufacturer to help improve quality control. Have a wonderful week!
Rapid response to replace my faulty instant gas hot water heater. Friendly and trustworthy staff. Very pleased with service.
Response from the owner:We appreciate your support and are thrilled to know you’re happy with your hot water system! Have a lovely rest of your week
Update to my previous review .. GREAT AFTER SALES SUPPORT from Sam and the company for the installation that I had done .... Initially I had a problem with freeze issues on a rinnai solar heater panel. It failed on a friday and this company was very supportive and able to replace defective units under warranty by the following tuesday. Awesome support and customer detail. Thank you .. up here in littlehampton during winter not having access to a hot shower is like medieval torture .... HOT WATER BLISS AGAIN :)
Response from the owner:Hi Adam, we're so glad we could help out and really appreciate you taking the time to leave a review
Excellent service. Right from the initial online enquiry, which prompted an immediate phone response, the consultant listened to our needs and a new system was installed the next day, super quick and very professional throughout. Highly recommend.
Colin Mason
Colin Mason
Response from the owner:Thanks for your amazing review! It was a pleasure helping you with your hot water system. If you ever need us again, we’re just a call away!
Fast quote, fair price, excellent value and they happily answered my sometimes annoying questions. Everything was included in the quote, and the workmanship was outstanding. They even came in under the quote as the remote couldn't be installed.
Absolutely will use again, and highly recommend for all.
Absolutely will use again, and highly recommend for all.
Response from the owner:Thank you for the wonderful review! We truly appreciate your kind words and are so glad we could help. Enjoy your hot water!
Recently installed Rinnai infinity 16 gas continuous system from HOTWATER.com.au, got the competitive quote within few hours and done the quality job very quick whole process was pretty fast. Thanking to trustworthy company and all team, definitely highly recommend this company and their services.
Response from the owner:Hi Dinesh, thank you for taking the time to leave such a positive review! We’re so happy you’re satisfied with our service and look forward to helping you again.
Response from the owner:Thanks for taking the time to leave a review Khoa, have a great week! :)
This company is the best, most caring plumbing company that we have ever done business with. They are punctual, top tradespeople and they do a brilliant job, the company couldn't do enough for us this all starts with there office staff. We definitely recommend them re there exceptional high quality workmanship. Thankyou "hot water.com.au" Bob Tuddenham
Response from the owner:WOW thank you so much for your kind words! We truly appreciate you taking the time to leave us such a glowing review, and I'll be sure to pass this onto the whole team. If you ever need anything in the future, please don't hesitate to reach out. Thank you again Bob and Sue, it was our pleasure 🥰
Great service very professional company to deal with, excellent heat pump, will recommend to anyone
Response from the owner:Thank you so much Roy 😊 that's wonderful to hear! Have an awesome week
Hotwater.com.au installed an iStore 270 Litre hot water heater today. The water heater installers and the electrician were superb.
Efficient, extremely tidy, courteous - and explained the operation of the new Water Heater clearly and in fine detail. We are very pleased.
Efficient, extremely tidy, courteous - and explained the operation of the new Water Heater clearly and in fine detail. We are very pleased.
Response from the owner:Thank you for the wonderful review! It was our absolute pleasure 😊
My off-grid property in the Adelaide Hills recently installed the IStore 270L Heat Pump hot water system installed by Hotwater.com.au.
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.
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.
Response from the owner:Thank you so much for the glowing review! We’re thrilled to hear and I'll be sure to pass this onto the team 😊
There service was prompt and honest in pricing.
Excellent, highly recommended.
Excellent, highly recommended.
Response from the owner:Thank you so much, that's wonderful to hear! 😊 we hope you have a lovely rest of the week
Professional, quick and efficient very satisfied
Response from the owner:Thank you for taking the time to leave us such a lovely review, it's much appreciated 😊
Fantastic Team, great service, super trades, on time and always ready to assist.
Response from the owner:Thank you so much Garth for leaving us a review! 😊 It means a lot to the team. We hope you have a wonderful rest of the week.
Excellent service at a competitive price. Can recommend and would use them again.
Response from the owner:Thank you so much Robert! 😊 have a great week (and stay cool!)
great team to deal with and there were no hidden costs 👍 👍
Response from the owner:Thank you Bob for leaving us a review! Have a wonderful rest of the week 😊
Needed to replace a leaking hot water service. Got several quotes for heat-pump units. Got best quote quickly from Hotwater.com.au. Had a new unit within 24 hours. Quick response, competitive quote and excellent work.
Response from the owner:Thank you so much Greg for the review, wonderful to hear! We hope you have a wonderful week 😊
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