Goes Electric

Enviroflo™ GR Series 300L

Rinnai NZ

Rinnai Enviroflo integrated hot water heat pump standing against a white wall outside a modern home, digital display reading 60°, surrounded by native flax and tussock planting.
Enviroflo™ GR Series 300L
4.1
COP
300 L
Tank
9.5c
Running Cost/kWh
46 dB(A)
Noise
R290
Refrigerant
$7,000
Installed from

Who is it a good fit for?

  • Rinnai loyalists wanting a more affordable option than HydraHeat — $6,000–$7,000 vs $8,000–$10,500 for HydraHeat.
  • Homes in hard water areas — suitable for both hard and soft water, important in Canterbury and similar regions.
  • Buyers who want built-in Wi-Fi — app-based monitoring and control (which HydraHeat lacks).
  • Medium to large households — 215L (2–3 people), 265L (3–4 people), 300L (4–5 people).
  • Those on a moderate budget wanting a trusted NZ brand — Rinnai’s established dealer and service network.

Review

Performance and efficiency:

The Enviroflo GR sits below Rinnai’s premium HydraHeat as a more affordable entry into the Rinnai ecosystem.

Features:

  • Built-in Wi-Fi: (which the HydraHeat lacks) provides app-based monitoring and control.
  • Suitable for both hard and soft water areas: important in regions like Canterbury where hard water can damage heat exchangers.
  • The Enviroflo uses a higher refrigerant input (1.1kW) than some competitors, but compensates with robust performance across a wider ambient range (to 45°C).

Supply and service:

Rinnai New Zealand is the Auckland-based arm of the Japanese Rinnai group and supplies through the mainstream plumbing merchant channel, so the Enviroflo GR and HydraHeat units are widely stocked and readily quoted by installers nationwide.

Its after-sales position is the strongest in this category: an authorised service centre network covering fourteen regions across both islands, searchable by product type, with online service booking and a requirement that installation, servicing and repair be carried out only by authorised personnel.

Specs

Enviroflo™ GR Series 300L

Cost & efficiency

Typical installed price
$7,000
COP (rated)
4.1
Test conditions
Inlet 19°C / Outlet 55°C / Ambient 19°C
Test standard
AS/NZS 5125:2014
Eff. cost/kWh
9.5c
Input power
1.1 kW
Heating capacity
2.75 kW
Household size
3–4 people

Hot water performance

Tank size
300 L
Max temperature
65 °C
Hot water output
~280L @ 40°C
Recovery rate
66 L/hr
Max water pressure
Tank material
Enamel (steel)
Tank insulation
Not provided
Backup element
2.4kW element

Installation & dimensions

System type
Integral (all-in-one)
Indoor / outdoor
Primarily outdoor (indoor possible if non-occupied space)
Min clearance / space
See installation manual
Min space required
No min space listed
Dimensions (H×W×D mm)
2055×640mm (Hר)
Unit weight (empty)

Climate & environment

Refrigerant
R290 (GWP 3)
Operating range
-7 °C to 45 °C
Noise
46 dB(A)
Heating capacity
2.75 kW

Controls & features

Display type
Control modes
Standard, ECO, Hybrid, Electric, Vacation
Smart / Wi-Fi
No
Solar PV ready
Yes

Warranty & support

Tank warranty
7 years cylinder (residential) 3 years labour
Parts & labour warranty
3 years refrigeration; 1 year other parts
Installer restriction
Any licensed plumber
Supplier / brand
Rinnai NZ

Get a free quote

Get matched with a trusted installer and a quote.