Thermann 21R Continuous Flow 50C Natural Gas

The Thermann 21R Continuous Flow 50°C Natural Gas system delivers energy-efficient, instantaneous hot water tailored for modern homes. With a high 6.1-star energy rating and Japanese-manufactured internal components, this system ensures consistent hot water supply at a pre-set safe temperature of 50°C, making it ideal for families or households requiring safe, reliable, and efficient performance. Its compact wall-mounted design allows for seamless outdoor installation, and it includes advanced frost protection features.

FEATURES:

Heating Method:
Gas burner with direct electronic ignition

Hot Water Supply:
Continuous flow – instantaneous hot water on demand

Recovery Time:
Instantaneous; no storage tank, heats water as needed

Installation Location:
Outdoor wall-mounted only

Water Pressure:

• Minimum: 200 kPa
• Maximum: 1000 kPa

Energy Efficiency:
6.1 Star energy rating

Operating Costs:
Reduced due to high thermal efficiency and low standby loss; safe 50°C delivery minimizes unnecessary reheating

Best for:

• Homes with 2–3 bathrooms
• Households needing continuous hot water
• Locations requiring pre-set safe temperature output (50°C)

Number of Bathrooms and People (Capacity):

• Suitable for 2–3 outlets
• Delivers 21 L/min at 25°C rise, ideal for 2 bathrooms and up to 4 people

Additional features:

• 50°C factory preset temperature for user safety
• Built-in freeze protection
• Optional temperature controllers available
• Includes water inlet filter for clean operation
• Japanese-manufactured internal components for reliability
• Suitable for installation with water-efficient tapware

The Bosch 13H Instant Gas Hot Water System (TF325-8G) is a compact and efficient continuous flow unit that utilises HydroPower ignition technology—requiring no electricity to operate. It is powered by water flow, making it ideal for energy-conscious homes and off-grid installations. With a delivery rate of 13 litres per minute at a 25°C temperature rise, it offers a reliable hot water solution for smaller households. This external system is equipped with advanced safety features and delivers hot water only when needed, reducing energy waste.

FEATURES:

Heating Method:
Gas burner with HydroPower ignition – no mains power required

Hot Water Supply:
Continuous flow – heats water on demand

Recovery Time:
Instantaneous – water is heated as it flows through the system

Installation Location:
Outdoor wall-mounted installation only

Water Pressure:

• Maximum (static): 800 kPa
• Minimum operating: 40 kPa
• Minimum constant pressure for minimum flow: 100 kPa
• Minimum constant pressure for maximum flow: 140 kPa

Energy Efficiency:
N/A – Star rating not specified

Operating Costs:
Economical operation as it heats only when required; no pilot light or standby energy use

Best for:

• Small to medium-sized households
• Homes with 1 bathroom
• Properties without 240V power (e.g. rural or off-grid locations)

Number of Bathrooms and People (Capacity):

• 1 bathroom
• Suitable for 2–3 people depending on climate and usage

   

Additional features:

• No electrical connection required – ideal for areas without power
• Hydrogenerator-powered ignition: ignites when water flows
• LED status indicators (green = flame detected, red = fault)
• Adjustable gas and water flow controls for fine temperature regulation
• Water filter included at cold water inlet to prevent internal blockage
• Not suitable for commercial, recirculation, or solar booster use
• Requires servicing every 2 years to maintain performance
• Built-in flame failure detection and overtemperature protection

The Thermann 17R Continuous Flow 50°C Natural Gas (NG) hot water system is a compact, highly efficient unit designed for consistent hot water delivery in smaller households. Engineered with performance and reliability in mind, it features Japanese technology to ensure precise temperature control and dependable service. This system saves space and energy perfect for anyone who wants hot water whenever they need it. It is perfect for homes with 1 to 2 bathrooms and provides dependable performance whether you live in the city or the suburbs.

FEATURES:

Heating Method:
Gas (Natural Gas), Continuous Flow

Hot Water Supply:
Continuous, on-demand delivery up to 17L/min @ 25°C rise

Recovery Time:
Instantaneous (no storage tank)

Installation Location:
External wall mount

Water Pressure:
Min: 200 kPa | Max: 1000 kPa

Energy Efficiency:
6.0 Star rating (50°C model)

Operating Costs:
Lower gas consumption at 126 MJ/h (NG) for cost efficiency

Best for:
Small households with 1–2 bathrooms and up to 3 people, especially where space is limited and constant hot water is desired

Number of Bathrooms and People (Capacity):
1–2 bathrooms
Up to 3 people

Additional Features:

• Optional remote controllers for the main and bathroom control
• Optional pipe covers and recess boxes for streamlined installations
• Low-profile unit design
• Suited for use with water-efficient fixtures

The Vulcan Freeloader 170Ltr Gas Storage Hot Water System is designed to offer durable, reliable and affordable hot water for Australian households. Engineered with a tough steel cylinder and proven gas technology, this unit ensures consistent performance even under varied water and pressure conditions. With a 4-star energy rating and a quick recovery time, it’s an excellent solution for medium to large households requiring steady hot water access.

FEATURES:

Heating Method: Gas

Hot Water Supply: Mains pressure — full flow to multiple taps at once

Recovery Time: Quick Recovery

Installation Location: Outdoor installation (must be installed with the back of the heater against a wall)

Water Pressure:

With Expansion Control Valve: 960 kPa
Without Expansion Control Valve: 1120 kPa

Energy Efficiency: 4-star energy rating

Operating Costs: Moderate due to gas fuel efficiency and high recovery rate

Best for: Medium to large families in moderate to cool climates

Number of Bathrooms and People (Capacity):

• Moderate climate: 3–5 people
• Cool climate: 3–4 people

Additional Features:

• Balanced flue system for optimal ventilation
• Steel jacket for durability
• Readily available spare parts across Australia
• Easy servicing by most plumbers and gasfitters
• Lighting instructions positioned behind access cover

Thermann 170Ltr Gas Storage Hot Water System – designed to serve medium-sized to large homes with consistent and effective hot water delivery. This 4-star gas storage system guarantees complete mains pressure and a changeable thermostat for control and safety. Offering modern efficiency and convenience, its small footprint and clever design make it the perfect replacement solution for older gas units.

FEATURES:

Heating Method: Gas (Natural Gas or LPG)
Hot Water Supply: Mains pressure continuous supply
Recovery Time: Rapid, with a recovery rate of 146L/hr @ 45°C rise (NG)
Installation Location: Outdoor installation
Water Pressure: Max inlet pressure 1,120 kPa
Energy Efficiency: 4-Star rating
Operating Costs: Moderate, controlled via adjustable thermostat
Best for: Medium to large households upgrading from older gas units
Number of Bathrooms and People (Capacity): 3–5 people 

Additional Features:

• Full mains pressure to all outlets
• Small footprint ideal for direct replacements
• Simple ignition and control system
• Durable enamel tank construction
• Rust-proof polymer base
• Manufactured to Australian standards

Designed for smaller homes or apartment with low hot water demand, the Rinnai Infinity 12 is a compact and effective gas continuous flow hot water system. Without a storage tank, this unit delivers dependable hot water on demand with a sleek, slimline form and engineered with premium Japanese components. The Infinity 12 promises continuous hot water systems even in demanding Australian conditions, thanks to outstanding energy efficiency, temperature stability, and clever safety systems.

FEATURES:

• Heating Method: Gas Continuous Flow
• Hot Water Supply: Instantaneous, continuous flow—no storage required
• Recovery Time: Immediate recovery due to on-demand heating
• Installation Location: External installation
• Water Pressure: Minimum 120 kPa / Maximum 1000 kPa
• Energy Efficiency: 6.2 Star rating
• Operating Costs: Highly economical, approx. $135–$380 per annum depending on household size
• Best for: Small households, compact spaces, single-bathroom homes, warm climate zones
  
  

Number of Bathrooms and People (Capacity):

1 bathroom / 1–2 people (Warm Climate)
1 bathroom / 1 person (Cool Climate)

FEATURES:

Heating Method: Direct electronic ignition with automatic flame sensing.

Hot Water Supply: Continuous flow, instantaneous hot water system.

Recovery Time: Instantaneous – continuous flow design.

Installation Location: External (outdoor installation only).

Water Pressure:

• Minimum Operating Water Pressure: 120 kPa
• Maximum Operating Water Pressure: 1000 kPa.

Energy Efficiency: 6.1 Star energy rating.

Operating Costs: Reduced operating costs through highly efficient heating, minimized gas consumption, and lower greenhouse gas emissions.

Best for:

• Small households or apartments
• 1 bathroom homes
• Energy-conscious installations where compact size is a priority.

Number of Bathrooms and People (Capacity):

• 1 bathroom
• Ideal for up to 2-3 people, depending on usage.

Additional Features:

• Puretemp™ Temperature Stability Control for precise and stable outlet temperatures
• Smart Controller Compatibility for remote temperature control and safety
• Anti-Frost Protection down to -20°C
• Durable UV Stabilised Powder-Coated Case for tough outdoor conditions
• Advanced Safety Monitoring & Diagnostics Display
• High-Performance Gas Control Valve ensures accurate gas supply
• Compatible Accessories: Pipe cover (PCD01W), metal recess box (RBOX06LW), SmartBox for recessed wall installations

Made particularly for Australian consumers, the small, high-efficiency Rinnai B26 continuous flow hot water system is designed to provide a consistent supply of hot water on demand in Australia’s climate. Combining anti-frost protection, Puretemp™ temperature control, and advanced combustion technologies, the B26 from Rinnai’s Infinity series, made to be both reasonably cheap and efficient, is a good choice for homes seeking unlimited hot water with low energy use.

FEATURES:

Heating Method:
Gas-powered continuous flow (instantaneous) heating

Hot Water Supply:
Continuous supply on demand — never runs out

Recovery Time:
Not applicable — instant hot water system

Installation Location:
External wall mount (Outdoor use)

Water Pressure:
Minimum 200 kPa, Maximum 1000 kPa

Energy Efficiency:
6 Star rating

Operating Costs:
Annual estimated energy costs (natural gas):

1 person: $135

2 people: $235

3 people: $310

4 people: $380

Best for:
Medium-sized households in warm to cool climates; ideal for 1–2.5 bathrooms

Number of Bathrooms and People (Capacity):

• Warm Climate: 1–3 shower outlets
• Cool Climate: 1–2.5 shower outlets

The Thermann 135Ltr Gas Storage Hot Water System delivers reliable, full-flow mains pressure hot water with the efficiency and performance expected of a modern 4-star rated appliance. Designed with upgradeability and energy efficiency in mind, it fits the same footprint as many older units, making it ideal for replacement installations. With a robust vitreous enamel tank, adjustable thermostat, and high first-hour capacity, this system is suitable for medium-sized households seeking both performance and value.

FEATURES:

Heating Method:
Gas burner with pilot ignition and thermostat-controlled temperature setting

Hot Water Supply:
Mains pressure storage – delivers consistent hot water to multiple outlets simultaneously

Recovery Time:
126 L/hr (Natural Gas) at 45°C rise
113 L/hr (LPG) at 45°C rise

Installation Location:
Outdoor installation only

Water Pressure:

• Maximum inlet pressure: 1120 kPa
• Relief valve pressure: 1400 kPa

Energy Efficiency:
4 Star energy rating

Operating Costs:
Efficient combustion and insulation help reduce gas usage and standby heat loss. Adjustable thermostat provides cost control and temperature customization

Best for:

• Medium households
• Homes upgrading from older gas units
• Users who require full mains pressure and reliability

Number of Bathrooms and People (Capacity):

• Ideal for 2–4 people
• Suitable for 1–2 bathrooms

Additional features:

• Compact footprint ideal for direct replacements of older units
• Adjustable thermostat for precise temperature control
• Pilot ignition system with user-friendly access panel
• Complies with AS/NZS safety and performance standards
• Built for Australian conditions – suitable for hard water with optional aluminium anode

The Rinnai B20 Instant Gas Hot Water System delivers a reliable 20 litres per minute of continuous flow hot water with a 6.0 Star energy rating, making it a popular choice for modern households and apartments. Part of Rinnai’s Builders Series, this compact unit is manufactured with high-quality Japanese components and engineered to perform efficiently, reducing operating costs and environmental impact. It is suited for external installation and features direct electronic ignition with Puretemp™ temperature stability technology.

FEATURES:

Heating Method:
Gas – direct electronic ignition with automatic flame sensing

Hot Water Supply:
Instantaneous continuous flow, heats water on demand

Recovery Time:
Instantaneous – continuously heats as needed

Installation Location:
External installation only

Water Pressure:

• Minimum: 160 kPa
• Maximum: 1000 kPa

Energy Efficiency:
6.0 Star energy rating

Operating Costs:
Economical operation due to high efficiency and reduced standby loss; lower greenhouse gas emissions

Best for:

• 1 to 2 bathroom homes
• Households prioritising efficiency and reliability in a compact design

Number of Bathrooms and People (Capacity):

• Suitable for 1–2 bathrooms depending on climate
• Ideal for 2–4 people

Additional features:

• Puretemp™ temperature stability control ensures consistent outlet temperature
• Optional Smartstart® preheat system for water conservation
• Compatible with low-flow WELS showerheads
• Compact, sleek Japanese design for flexible placement
• Built-in frost protection (where required)
• Compatible accessories: pipe covers, recess boxes, flue diverters, and security brackets
• Compatible with temperature limiting devices (TLDs)

Affordable, high-performance hot water systems. The Vulcan Freeloader 135L is built with high-strength steel and proven Rheem technology, it features a balanced flue and enamel-lined storage cylinder designed to handle tough water conditions and high pressure. Vulcan’s compact outdoor design, with its 4-star energy rating, and quick recovery capability make it a popular choice for Australian families seeking dependable mains pressure hot water.

FEATURES:

Heating Method:
Gas burner with Piezo ignition and thermostat-controlled operation

Hot Water Supply:
Mains pressure storage tank with continuous heating during use

Recovery Time:
Approx. 113 L/hr at 45°C rise (LPG) and 126 L/hr at 45°C rise (Natural Gas)

Installation Location:
Outdoor installation only (must be installed with back against a wall)

Water Pressure:

• Max inlet pressure without ECV: 1120 kPa
• Max inlet pressure with ECV: 960 kPa
• Relief valve setting: 1400 kPa

Energy Efficiency: 4 Star energy rating

Operating Costs:
Economical operation with lower hourly gas consumption (27 MJ/h NG) and reduced standby heat loss due to insulation

Best for:

• Households needing full mains pressure hot water
• Those replacing older outdoor gas units
• 2–4 person families

Additional Features:

• Easy-to-use Piezo push-button ignition system
• Adjustable thermostat (factory set at 60°C, max 65°C)
• Compatible with expansion control valve
• Built with high-strength steel to withstand heating cycle pressures
• Steel jackets and balanced flue design for simple outdoor installation
• Servicing access via front panel with behind-cover lighting instructions
• Condensate drain outlet included
• ECV not supplied (required in certain regions)
• Made by Rheem in Australia