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Continuous Flow Hot Water Systems Melbourne — Endless Hot Water, Zero Storage
Plum Trade Services supplies and installs continuous flow (instantaneous) gas hot water systems across Melbourne and Geelong. Never run out of hot water again — with same-day replacements available.
- Endless hot water — never runs out
- Compact wall-mounted units — saves floor space
- Rated 4.9/5 stars (4,000+ Google Reviews)
- 6-year workmanship warranty on every installation
How Does a Continuous Flow Hot Water System Work?
A continuous flow hot water system — also called an instantaneous or tankless system — heats water on demand as it flows through the unit. There is no storage cylinder. When you turn on a hot water tap, a gas burner fires up and heats the water passing through a heat exchanger, delivering a continuous stream of hot water at your desired temperature for as long as the tap is open.
Because the unit only operates when hot water is required, there is no standing heat loss from a tank of stored water. This makes continuous flow systems substantially more energy efficient than storage systems for households that use hot water intermittently throughout the day.
Modern units — such as the Rinnai B-Series and Infinity range — include electronic temperature control, allowing you to dial in a precise delivery temperature and maintain it consistently regardless of water pressure fluctuations.
Best for: Busy households with multiple bathrooms, properties with limited space, or homes replacing an ageing gas storage cylinder.
Continuous Flow Systems We Supply & Install
We stock and install the leading continuous flow brands trusted by Melbourne plumbers for decades. Our team recommends the right model for your household's flow rate requirements and gas connection.
Rinnai B-Series
The most technologically advanced continuous flow range available today. Available in 16L (6.1 star), 20L (6.0 star), and 26L (6.0 star) variants. Supplied in a neutral Dune colour to suit most external walls.
Best SellerRinnai Infinity
Rinnai's flagship continuous flow range, offering unparalleled temperature precision, water conservation features, and consistent hot water delivery for larger households. Designed to withstand harsh Australian conditions.
Premium PerformanceBosch Continuous Flow
Bosch's continuous flow range provides reliable, electronically controlled hot water delivery backed by a strong manufacturer warranty. An excellent mid-range choice for family homes.
Reliable & AffordableDux Condensing 26L
Dux's condensing continuous flow system recovers heat from flue gases for exceptional efficiency. An outstanding choice for households wanting to minimise their gas consumption without sacrificing hot water output.
Ultra-EfficientHow Your Installation Works
From first contact to running hot water — Plum makes the process simple and stress-free.
Free Quote
We assess your home's gas connection, existing flue setup, and hot water demand to recommend the right unit and flow rate. Fully itemised, no hidden fees.
Same-Day Booking
For urgent replacements, we prioritise same-day installations. Continuous flow units are compact and quick to swap — most jobs are completed within a few hours.
Professional Installation
Our licensed gas fitters install your new unit, connect all gas and water lines, fit the tempering valve, and commission the system to your desired temperature setting.
Peace of Mind
Gas compliance certificate issued, old unit removed and disposed of, and your 6-year workmanship warranty activated. You're ready to enjoy endless hot water.
What's Included in Plum's Quote
Every Plum continuous flow installation is fully itemised with no surprises.
Gas and water connections, flue setup, and commissioning to your preferred temperature.
Required Australian standard safety components installed as standard on every job.
We remove, transport, and responsibly dispose of your old unit at no additional charge.
Official VBA gas compliance certificate issued for every installation, as required by Victorian law.
Industry-leading warranty on all Plum installations, on top of the manufacturer's product warranty.
We recommend the correct flow rate and model for your household before any work begins.
Continuous Flow Hot Water — Your Questions Answered
A storage system maintains a tank of pre-heated water that is ready for immediate use. A continuous flow (instantaneous) system has no tank — it heats water on demand as it flows through the unit. Continuous flow systems never run out of hot water, occupy far less space, and avoid the standing energy losses associated with keeping a tank heated all day.
Flow rate requirements depend on the number of simultaneous outlets you need to supply. A 16L/min unit suits smaller households or single-bathroom homes; 20L/min is suitable for most Melbourne family homes; 26L/min is recommended for larger properties with multiple bathrooms where two or more hot water outlets may be running concurrently. Our team assesses your home before making a recommendation.
Installed pricing for a continuous flow system typically starts from around $1,500 for a straightforward like-for-like replacement, rising to $2,500 or more for premium models or installations requiring new flue runs. Call us on (03) 8360 9622 or submit a quote request for an accurate, itemised price.
Gas continuous flow systems run on natural gas rather than electricity, so they do not directly integrate with solar panels. However, if reducing your environmental footprint and energy costs is a priority, a heat pump hot water system — which runs on electricity and pairs directly with solar — may be a better long-term choice. Our team can discuss both options with you.
Yes, in most cases a storage unit can be replaced with a continuous flow unit. The key requirements are an existing natural gas connection and suitable external wall space for mounting. Our team will assess your property to confirm suitability and advise on any additional work required, such as a new gas meter or updated flue run.
