Description
GAUS-300FQTSHeat Pump Hot Water
Perfect for 2–5 people. The Sanden GAUS-300FQTS uses natural CO₂ (R744) refrigerant with a COP of up to 5.96 — saving up to 80% on hot water costs. Ultra-quiet split system with built-in freeze protection to -10°C. Backed by a 6-year heat pump and 15-year pro-rata tank warranty.
CO₂ Technology — The Most Efficient Refrigerant Available
The Sanden GAUS-300FQTS uses R744 (CO₂) — a 100% natural refrigerant with zero ozone depletion and zero global warming potential — to deliver extraordinary efficiency even in cold weather, when most heat pumps struggle.
Up to 80% Less Energy
With a COP of up to 5.96, the Sanden delivers exceptional efficiency. CO₂ technology performs best in cooler conditions — unlike conventional refrigerants that lose efficiency in cold weather.
CO₂ Natural Refrigerant (0 GWP)
R744 (CO₂) has zero global warming potential and zero ozone depletion potential. It’s one of the most environmentally responsible refrigerants available and is future-proofed against regulatory changes.
Freeze Protection to -10°C
Built-in freeze protection means reliable hot water in all Australian climates. The system operates from -10°C to +43°C — exceptional cold-weather performance without any supplementary element.
Industry-Leading Quiet: 37–38 dB
At 37–38 dB, the Sanden heat pump is among the quietest in Australia — quieter than a normal conversation. Install near bedrooms or neighbouring properties with confidence.
STC Rebates Available
Qualifies for federal Small-scale Technology Certificates significantly reducing your upfront cost. We handle all the paperwork and pass the saving directly to you.
Australian-made stainless steel Storage Tank
The GAUS-300FQTS tank is constructed from Australian-made stainless steel for long-lasting corrosion resistance. Backed by a 15-year pro-rata warranty.
Heat Pump & Tank Installed Separately
The Sanden is a true split system — the heat pump unit and storage tank are installed separately, up to 4 metres apart. This means the noisy pump unit can be placed outside or away from living areas, while the tank goes exactly where you need it.
- Up to 4m separation between pump and tank
- No refrigeration mechanic required — plumber + electrician only
- Flexible indoor or outdoor tank placement
- Compact heat pump unit fits in tight spaces
6-Year Heat Pump + 15-Year Tank
The Sanden warranty is one of the best in the industry — 6 years on the heat pump unit and 15 years pro-rata on the storage tank, covering you long after most competitors’ warranties have expired.
- 6 years — heat pump unit warranty
- 15 years — pro-rata storage tank warranty
- Australian Consumer Law protections apply

37–38 dB — Among the Quietest Available
The Sanden CO₂ heat pump is one of the quietest hot water systems on the market. Measured at 37–38 dB at one metre — quieter than a library or a quiet conversation — it runs day or night without disturbing the household. The CO₂ inverter compressor operates with significantly less mechanical noise than conventional R410A or R32 compressors.
- 37–38 dB at 1 metre — one of the quietest heat pumps available in Australia
- CO₂ inverter compressor — low mechanical noise by nature of the refrigerant cycle
- Anti-vibration isolation mounts on the outdoor unit — no structure-borne hum
- Wi-Fi timer scheduling — run overnight on off-peak tariffs without disturbance
- Suitable for installation immediately adjacent to bedrooms and living areas

SUS316L Stainless — No Anode, No Maintenance
Sanden’s stainless steel tanks use SUS316L — the same marine-grade specification used in food processing and coastal infrastructure. No sacrificial anode is needed: zero corrosion risk, zero tank maintenance. Rated for high-chloride coastal environments across Australia. Backed by a 10-year cylinder warranty.
- SUS316L marine-grade stainless steel cylinder — corrosion-proof for life
- No sacrificial anode required — completely maintenance-free tank
- Rated for coastal and high-chloride water environments
- Does not pit, rust, or scale in hard water conditions
- 10-year cylinder warranty. WARRANTY CONDITIONS APPLY.
Technical Specifications
Warranty Coverage
The Sanden GAUS-300FQTS is backed by one of the best warranties in the Australian heat pump market.
15-year pro-rata warranty on the storage tank. WARRANTY CONDITIONS APPLY.
6-year warranty on the heat pump unit. WARRANTY CONDITIONS APPLY.
Government Rebates & Energy Certificates
Applicable incentives are applied as a point-of-sale discount. No claiming, no paperwork on your end.
Delivery Information
All sales need to be within a 50 km radius of a town with a population over 30,000. For all other areas, please phone to check delivery options.
Need Hot Water Fast?
Shop online or call for same-day service across Wollongong and surrounding areas.



