Tankless
Tankless Hot Water Systems Sydney: Continuous Flow Specialists
Space-saving tankless hot water systems providing endless hot water on demand.
- ✓ Endless hot water
- ✓ Space saving
- ✓ Energy efficient
- ✓ Long lifespan
Starting from $2,200
About our tankless hot water systems service
Infinity Hot Water provides fast, reliable tankless hot water systems across Sydney, the Central Coast and Newcastle. Whether you are dealing with a sudden breakdown, planning an upgrade, or comparing systems for a new build, our licensed plumbers and gasfitters handle every job from initial site visit through to final commissioning and council compliance paperwork.
We service every major brand — Rheem, Rinnai, Dux, Bosch, AquaMAX, Vulcan, Sanden, Reclaim Energy, Stiebel Eltron, Thermann, Chromagen and iStore — and carry common spare parts on every van so most jobs are completed in a single visit. Space-saving tankless hot water systems providing endless hot water on demand.
All work is quoted up front in writing, completed to AS/NZS 3500 standards, and backed by a 12-month workmanship warranty plus full manufacturer warranty on any new equipment installed. Call 0420 102 207 for a same-day appointment or request a quote online.
Tankless hot water Sydney: endless hot water sized to your home
Tankless hot water systems Sydney wide heat water only as it flows, so you never run out and you lose nothing to standby heat loss. Sizing is what makes or breaks the result: 20 to 24 L/min suits three people, 26 L/min covers a typical four to five person family, and 32 L/min handles three simultaneous outlets.
We install and repair Rinnai Infinity, Bosch, Rheem and Thermann continuous flow units. If you are switching from a storage tank, our hot water plumber Sydney team checks gas line and meter capacity first so your new hot water heater performs at rated flow.
Why flow rate, not tank size, is the number that matters
Tankless units are rated in litres per minute at a given temperature rise. A shower draws around 9 L/min, a kitchen tap 6 L/min. Two showers at once therefore need at least 20 L/min of real capacity in winter, when incoming mains water in Sydney drops to roughly 14 to 16 degrees and the unit has to work harder for the same output.
That winter temperature rise is why a unit that felt fine in February can disappoint in July. We size for the coldest month, not the average, so performance does not fall away exactly when you notice it most.
Gas supply, minimum flow and the cold water sandwich
Continuous flow units are only as good as the gas delivered to them. A 32 L/min unit on a line sized for an old storage heater will never reach rated output, so we check meter capacity and line sizing before quoting an upgrade rather than after installation.
The brief cold slug some homes notice between two short draw offs is normal burner behaviour rather than a fault, and it is largely solved with correct sizing, sensible plumbing runs and, where it genuinely bothers a household, a small buffer arrangement. We explain the trade offs rather than selling hardware that does not fix the cause.
What's included
Every job comes with these as standard.
Why choose Infinity Hot Water
What sets our service apart.
Same-day service
Urgent jobs answered within 90 minutes across the Sydney metro, Central Coast and Newcastle / Lake Macquarie.
Fixed up-front pricing
Written quotes before work starts. No hidden call-out fees, no surprises on the invoice.
Licensed specialists
NSW-licensed plumbers and gasfitters with manufacturer accreditation for Rheem, Rinnai, Dux, Bosch and more.
12-month workmanship warranty
Every job is backed in writing, on top of the full manufacturer warranty on any new equipment.
Genuine spare parts
Vans stocked with valves, elements, thermostats, anodes and PTR valves so most repairs are done in one visit.
Rebate paperwork handled
For heat pump and solar installs we lodge the small-scale technology certificates (STCs) so you receive the rebate at point of sale.
How our tankless hot water systems service works
1. Site assessment
We measure your household demand (people, bathrooms, peak usage), check existing connections, and recommend the right size and type of system.
2. Fixed written quote
You get an itemised quote — unit, install, removal of the old system, valves, electrical or gas work, and any compliance certificates — with no hidden extras.
3. Professional installation
Licensed plumbers and gasfitters install to AS/NZS 3500, comply with the relevant gas / electrical / energy ratings, and remove the old unit from site.
4. Commissioning & paperwork
We commission the system, set safe tempering valves to 50°C, lodge compliance certificates and register the manufacturer warranty in your name.
Tankless Hot Water Systems pricing
Indicative pricing across Sydney, Central Coast & Newcastle. Every job is quoted in writing before any work begins — no hidden call-out fees.
| Item | From |
|---|---|
| Tankless Hot Water Systems — call-out & diagnosis | $0 |
| Typical tankless hot water systems job | $2,200 |
| After-hours / weekend surcharge | From $90 |
| Full system replacement (if recommended) | From $1,500 |
Brands we service
Accredited service and installation for every major Australian hot water brand.
Tankless Hot Water Systems — frequently asked questions
Tankless Hot Water Systems — suburbs we cover
- Tankless Hot Water Systems in Allambie Heights
- Tankless Hot Water Systems in Artarmon
- Tankless Hot Water Systems in Asquith
- Tankless Hot Water Systems in Balgowlah Heights
- Tankless Hot Water Systems in Beecroft
- Tankless Hot Water Systems in Belrose
- Tankless Hot Water Systems in Cammeray
- Tankless Hot Water Systems in Carlingford
- Tankless Hot Water Systems in Castle Cove
- Tankless Hot Water Systems in Castlecrag
- Tankless Hot Water Systems in Chatswood
- Tankless Hot Water Systems in Cheltenham
- Tankless Hot Water Systems in Cherrybrook
- Tankless Hot Water Systems in Cremorne
- Tankless Hot Water Systems in Davidson
- Tankless Hot Water Systems in Duffys Forest
- Tankless Hot Water Systems in East Killara
- Tankless Hot Water Systems in East Ryde
- Tankless Hot Water Systems in Eastwood
- Tankless Hot Water Systems in Epping
- Tankless Hot Water Systems in Ermington
- Tankless Hot Water Systems in Forestville
- Tankless Hot Water Systems in Frenchs Forest
- Tankless Hot Water Systems in Gladesville
- Tankless Hot Water Systems in Gordon
- Tankless Hot Water Systems in Greenwich
- Tankless Hot Water Systems in Hornsby
- Tankless Hot Water Systems in Hunters Hill
- Tankless Hot Water Systems in Killara
- Tankless Hot Water Systems in Killarney Heights
Related services
Emergency Hot Water Repair
Your Hot Water Back On — Guaranteed. Licensed plumbers, every system, any hour.
Hot Water Installation
Professional hot water system installation for all types and brands of hot water systems.
Gas Hot Water Systems
Gas hot water installation, repair, and maintenance for continuous and storage systems.
Need tankless hot water systems today?
Call Infinity Hot Water on 0420 102 207 for same-day service across Sydney, the Central Coast and Newcastle — or request a written quote online.