Gas Hot Water Systems Melbourne

Gas hot water remains a practical option for many Melbourne homes — particularly those with existing natural gas connections and no immediate plans to electrify. Zap Tech Energy installs and replaces gas hot water systems across Greater Melbourne, including continuous flow (instantaneous) and storage tank units.

Zap Tech Energy also installs heat pump and electric hot water systems. If you are considering switching from gas to a more energy-efficient option, Zap Tech Energy will explain the costs, rebates and long-term savings of each path so you can make an informed choice.

Continuous Flow vs Gas Storage — Which Gas System Is Right?

We help you compare and install the right option between continuous flow and gas storage systems

Gas Continuous Flow (Instantaneous)

Heats water on demand as it flows through the unit. No tank required.

Unlimited hot water — no waiting for a tank to reheat
Compact wall-mounted design — saves floor space
Only uses gas when hot water is being drawn
Available in natural gas and LPG models
Higher upfront cost than storage, but lower ongoing waste
Common brands: Rinnai, Rheem, Bosch

Best for: Households that use hot water at unpredictable times or have limited space for a tank.

Gas Storage

Heats and stores a tank of water, kept at temperature by a gas burner.

Lower upfront cost than continuous flow
Simpler installation — especially for like-for-like replacements
Consistent water pressure and temperature
Tank sizes from 90L to 360L
Pilot light or electronic ignition models available
Standing heat losses (the tank continuously loses heat, especially in cooler locations)

Best for: Budget-conscious replacements where the existing infrastructure supports a storage unit.

Gas Hot Water System Cost in Melbourne

System Type	Typical Installed Cost	Best For
Gas storage 135L	$1,500–$2,200	1–2 person households
Gas storage 170L	$1,700–$2,500	2–3 person households
Gas storage 260–360L	$2,000–$3,000	Larger families
Continuous flow (natural gas)	$2,200–$3,500	Most households with gas
Continuous flow (LPG)	$2,500–$3,800	Homes without natural gas

Prices include supply, installation, gas fitting and flue work. Additional costs may apply if gas piping needs modification or if a tempering valve upgrade is required.

Request a Free Quote Online

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Why Choose Zap Tech Energy for Gas Hot Water

Licensed electrician and gas installer — REC 34973, all electrical, gas fitting and flue work handled properly
Full-service capability — Zap Tech Energy installs gas, electric and heat pump systems, so recommendations are based on what suits your household
Clear, itemised quotes — pricing covers the unit, gas fitting, flue work, tempering valve and any plumbing modifications
Compliance guaranteed — all gas work meets Victorian regulations with a compliance certificate issued for every installation

What Melbourne Homeowners Say

    
 
 
      Trustindex verifies that the original source of the review is Google. The Team at Zap Tech are first class. From first contact with Daniel who was very informative and helped me to decide the optimal solar/battery system for my needs, to Josh and Joel who implemented the system professionally. The after sales support has been great, with the team responding promptly to my queries. The level of trust with these guys was higher than any experience I’ve had before, and was happy to also upgrade to a heat pump of Josh’s recommendation without questioning it. Highly recommend the team to anyone looking at a solar/battery system.
  
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   Dimitri Peries 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. I had a 13kw system installed with a 30kw battery. It was really important to my husband and I to get quality so we wanted to go with a local company having read the horror stories about all the companies that are now so called solar installers. Our system is fantastic, the guys all did a fantastic job. They explained everything to us, helped us choose the right system for our location and needs. They were so professional, we couldn’t be happier with everyone at the company and can’t recommend them enough. They are a quality company and knowledgeable experts at everything solar. One thing that’s really stood out is the after care, when most just walk away Zaptech guys always respond to me. Daniel, Josh continuously answer my calls and get back to me when their busy. You get what you pay for and when you go cheap and cut corners you end up paying triple the amount for a system you’re not even happy with. Choose the best, choose Zaptech.
  
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   Courtney “Courtyp100” Powles 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. ZAP Tech Energy were approached because they installed at a neighbour who seemed happy with everything. Our experience was with Josh who gave prompt responses, helpful and knowledgeable answers to questions. The follow up site inspect went very well and Daniel was thorough and again gave helpful and knowledgeable responses. The day of install, Joel and the guys turned up on time and got the job done over two days. They were considerate, polite and worked well. The site was left neat and tidy and a we were given a great explanation on how the system would work. Admin under Andi was thorough and responsive. These guys are well organised amd competitive. They are definitely worth considering.
  
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   William 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Can’t recommend Zap Tech Energy highly enough. Right from the initial contact, through the quoting process, installation and commissioning I have been impressed. The installation was tricky but the Zap crew did a fantastic job and it looks great.
  
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   George Robinson 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. I had half an idea of PV and battery and found Josh and the team at Zaptech through a reliable source. They did a fantastic job from start to finish. The planning went well, consultation with us included. The install was professional and smooth, including a smooth commissioning. We’ve had almost zero grid cost since, including running an EV. Can recommend highly for your PV and battery needs.
  
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   Tom Huber 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. We recently had solar panels installed by Zap Tech Energy and could not be happier. From the quoting process to installation the team at Zap Tech were professional knowledgeable and transparent about the whole process and provided a competitive quote. The installation process was smooth.and it was clear they took pride in their workmanship and we are extremely happy with the final result. Overall we highly recommend Zap Tech Energy to anyone considering making the switch to Solar.
  
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   Sharyn Perkins 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Great experience using Zaptech, always willing to answer questions about my requirements and options  for my home. Never badgering me to commit, and happy to wait for installation dates that suited me. Very impressed with their professionalism from the quote process through to the instal. Would definitely recommend them to anyone.
  
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   Stephen Fassioms 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. Easy process from quote to install. Easy and straightforward overall and happy with the solar I ended up going with. Great communication, showed up on time and got the job done. Tidied up when the job was done and then helped me with how to use the system and set it up on my phone.
  
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   John 
 
 
 
 
     Trustindex verifies that the original source of the review is Google. We recently had Josh and his team install our solar panels (14kW) and battery (48kWh). Big job on a double storey home. The whole experience from inquiry to installation was magnificent. Josh's expertise is second to none. The installation team were incredible - timely, organised and did a great job of tidy up too. Faultless experience from a very professional small business. Thank you
  
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Should You Replace Gas With Gas — or Switch to Electric?

This is a genuine decision point for Melbourne homeowners, and Zap Tech Energy provides straightforward advice based on your specific situation.

Replace gas with gas when:

Consider switching to a heat pump when:

You have solar panels (or plan to install them) — a heat pump can run on free solar energy
You want to reduce gas bills long term — heat pumps cost 60–80% less to run than gas
You qualify for Victorian rebates — STCs, VEU and Solar Victoria can reduce a heat pump to a similar price as a gas replacement
You are planning to disconnect gas entirely — hot water is often the last gas appliance in a home

Zap Tech Energy installs both gas and heat pump systems and can quote both options for a direct comparison.

LPG Gas Hot Water for Homes Without Natural Gas

Not all Melbourne properties have a natural gas connection — particularly in newer estates, rural-fringe areas or properties that have had gas disconnected. For these homes, LPG gas hot water is an option using bottled gas.

However, LPG is significantly more expensive to run than natural gas. If your home does not have a gas connection, Zap Tech Energy recommends considering a heat pump or electric hot water system as a more cost-effective long-term solution before committing to LPG.

How Gas Hot Water Installation Works

# 1: Contact

Contact — Call 03 9404 0484 or enquire online with details of your current system.

# 2: Assessment

Zap Tech Energy reviews your gas supply, flue requirements, water pressure and household size to recommend the right unit.

# 3: Quote

Clear, itemised pricing covering the unit, gas fitting, flue work, tempering valve and any plumbing modifications.

# 4: Installation —

Licensed installer removes the old unit, installs the new system, connects gas and water, tests operation and checks flue compliance. Most replacements are completed within a few hours.

# 5: Compliance

All gas work meets Victorian regulations. A compliance certificate is provided for every gas hot water installation.

FAQ's

Gas Hot Water —
Frequently Asked Questions

How long does a gas hot water system last?

Gas storage tanks typically last 8–12 years. Gas continuous flow units can last 15–20 years with regular servicing. Lifespan depends on water quality, usage and maintenance.

Can I replace a gas hot water system myself?

No. Gas hot water installation in Victoria must be completed by a licensed gasfitter. Electrical connections must be completed by a licensed electrician. Zap Tech Energy holds Electrical Contractor's Licence REC 34973 and arranges all necessary licensed trades.

What is a tempering valve and do I need one?

A tempering valve mixes hot and cold water to deliver water at a safe temperature (50°C maximum) at fixtures accessible to children or vulnerable people. Victorian regulations require a tempering valve on all new and replacement hot water installations.

Is gas hot water being phased out in Victoria?

The Victorian Government has signalled a shift away from gas in new homes, and gas connection bans for new residential developments are being introduced. However, gas hot water systems can still be installed in existing homes with existing gas connections. Many households are proactively switching to heat pumps ahead of further policy changes.

How much does it cost to run a gas hot water system?

Annual running costs for gas hot water in Melbourne typically range from $400–$800 depending on household size, system type (storage vs continuous flow) and gas tariff. This is higher than heat pump running costs ($150–$300 per year) but lower than standard electric storage on peak tariff.

Should I switch to a heat pump?

If you have solar panels, plan to install solar, or want to reduce your gas bill, a heat pump is worth considering. After Victorian rebates, the installed cost of a heat pump can be comparable to a gas replacement — with significantly lower ongoing costs. Zap Tech Energy can quote both options for a direct comparison.

Zap Tech Energy

Need a Gas Hot Water Replacement in Melbourne?

Call Zap Tech Energy on 03 9404 0484 or submit an online enquiry. Whether you are replacing gas with gas or considering a switch to heat pump, Zap Tech Energy provides clear advice and a transparent quote.