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Thermann 21R Continuous Flow 50C Natural Gas Hot Water Systems Perth

Thermann 21R Continuous Flow 50C Natural Gas

Thermann 21R Continuous Flow 50C Natural Gas

Installation, repair and servicing throughout Perth
Efficiency
2-4 People
12 Years Warranty

Price: Supplied and installed from*

$1,050.00

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Thermann 17R Continuous Flow 50C Natural Gas

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
 

Specifications

Hot Water Delivery: 21L/min @ 25°C rise
Gas Consumption: 159 MJ/h (Natural Gas)
Weight (Empty) 15 kg
Height 520 mm
Width 350 mm
Depth 170 mm

Warranties

Manufacturers Tank Warranty (Domestic) 12 years on the heat exchanger
Manufacturers Parts & Labour Warranty (Domestic) 3 Years

Technical Specifications

Powerpoint Required: Yes – 230–240V AC, 50Hz (max output current: 0.44 A)
Gas Connection: R3/4" (20mm)
Hot Water Connection: R3/4" (20mm)
Relief Valve Pressure: 1620 kPa
Minimum Flow Rate for Ignition: 2.5 L/min
Test Point Pressure: 0.62 kPa
Water Inlet Connection: R 3/4" (20 mm)
Freeze Prevention Heater Power: : 129W
Input Current: 0.44 A
Test Point Pressure (NG): 0.62 kPa

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What Our Clients Say

Had an issue with a Gas Leak, called three 24hr Emergency repairers and the only one to answer the call was GA Perry. From the outset, they were professional and had a tech arrive within 2 hours as promised. After explaining my situation to the tech, he troubleshooted all possible areas of the issue. He had the issue resolved within 30 minutes, could not be happier with the service, 5 stars. Highly recommend.
Barry Edwards
Barry Edwards
Over the years that we have used GA Perry as our "go to property care providers" we have been totally impressed and satisfied with their professional, prompt and efficient work. Their communication and honesty with us as absentee landlords has been exceptional.
Kaye Saultry
Kaye Saultry
I have been using GA Perry for both their Plumbing and Elecrical services over a period of several years. I have full confidence in the quality of their service, their work ethics and customer needs.To be able to use a contractor that is guaranteed to do a professional job without trying to upsell or cut corners are the values I look for and know that GA Perry has always had my best interests at heart and I never need to doubt the quality of the service they have provided to me in the past and will continue to do so when I need their expertise next.
Rom Mum
Rom Mum
Just want to thank GA Perry for the professional service . Always on time and helpful . I have used them often and won’t use anyone else .
Jack Dawes
Jack Dawes
Very pleasant workers. Always friendly and efficient. Highly recommend.
Penelope Tolj
Penelope Tolj
The guy that reset my bathroom taps was so good, great advice, set it up so I could keep working and same guy came back when I was ready and finished the job.
Tim Hoath
Tim Hoath
I called after hours and spoke with the the after hours technician. He gave me brilliant advice and guidance on what I needed and how he could respond within a timeframe.When he arrived on time, the task was done quickly and efficiently and the bill was very reasonable. I couldn't thank the company enough. Thanks so much for the assistance.I would definitely recommend this business.
Derek Sheerin
Derek Sheerin
Rarely do I write reviews but from the first contact point on contact with Wayne on the phone through to Peter attending site on time and clearing our blocked drain promptly the service was 10/10. A truly professional, slick operation from start to finish. Thanks again GA Perry.
Amal Khan
Amal Khan
On time, friendly, reasonably priced, great service. Highly recommend.
Jessica Sheridan
Jessica Sheridan
Have used then numerous times. Trustworthy although can be pricey but can't complain as they come same day etc and they are experts. Very helpful!
nihongo02341
nihongo02341
The lad was so helpful, did an excellent job was on time, and I was extremely surprised at the amount I was quoted when job was completed. I was quoted a rediculous price by another Company $7900. Pays to shop around and I found G A Perry who I shall continue to use in future. Thankyou.. Valda Gainford
Valda Gainford
Valda Gainford
On time and on the ball. Excellent tradesman knew his stuff and advised the best outcome. Used this service three times recently for repairs. Highly recommend.
Anne Burns
Anne Burns
Was very quickly done thanks alot guys really happy your quick response 👍👍😊😊
Linda Fiaschi
Linda Fiaschi
Very professional and clean service. I was prompted to give this review but the opinion is my own.
Bronwyn Smith
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