Gas hot water systems are the most common type in Melbourne homes. They heat water quickly, handle high demand, and with modern continuous flow technology, only heat water when you use it. Here’s everything you need to know to choose and maintain one.
Gas Storage vs Continuous Flow: The Key Difference
Gas storage systems heat and store a tank of water (typically 135-315 litres). They provide immediate hot water but can run out during high demand periods. Storage systems cycle on and off throughout the day to maintain the set temperature — this standby heat loss makes them less efficient than continuous flow but they’re lower in purchase cost.
Continuous flow (instantaneous) systems heat water on demand as it flows through a heat exchanger — no stored water, no standby losses. They provide unlimited hot water and are significantly more energy efficient. Modern continuous flow units also have precise temperature control via a remote controller. They cost more to purchase and install but operating costs are lower.
Choosing the Right Size
For gas storage systems, sizing depends on household size: 1-2 people = 135-170L, 3-4 people = 170-250L, 5+ people = 315L+. For continuous flow systems, sizing is measured in litres per minute (L/min) of hot water output. Most Melbourne households need a 16-20 L/min unit. Larger homes with multiple simultaneous showers (master ensuite + kids’ bathroom running at the same time) should consider a 26 L/min or twin-unit setup.
Gas Hot Water System Costs in Melbourne
Gas storage system replacement (supply and install, like-for-like) costs $1,400-$2,200 depending on size. Continuous flow system replacement costs $1,600-$2,800 for a standard unit. New installations requiring gas pipe extension or flue modifications cost more. High-efficiency condensing continuous flow systems (the best efficiency available in gas) cost $2,500-$4,000 installed.
Gas Hot Water and Melbourne’s Future Energy Landscape
Victoria is phasing out gas connections in new homes from 2024. Existing homes can keep and replace gas appliances, but if you’re planning a major renovation or considering the long-term picture, a heat pump hot water system is worth evaluating. Heat pumps run on electricity, achieve 3-4 times the efficiency of electric resistance systems, and qualify for significant Victorian Government rebates.
Gas Hot Water Maintenance
Gas continuous flow systems require servicing every 2 years — this is a regulatory requirement for gas appliances in Victoria. Service involves cleaning the burner, inspecting the heat exchanger, checking the flue, and testing safety controls. Storage systems benefit from annual inspection and anode rod replacement every 5 years to prevent internal tank corrosion. Regular servicing extends system life significantly.
Sedcon Plumbing — Gas Hot Water Specialists in Melbourne
We supply, install, and service gas hot water systems across Melbourne. Same-day replacement available for failed systems. Call 0468 013 012 for a quote or emergency replacement.