Gas · Continuous Flow Hot Water Systems
Not designed for commercial use
12 Year Heat Exchanger
3 Year Parts and
Labour
5 Year Heat Exchanger
3 Year Parts and
Labour
1 Year Heat Exchanger
1 Year Parts and
Labour
Save space with a small footprint mounted on your
wall
They heat water as you need it, so you will never
run out of hot water
Controllers can be installed to accurately deliver
the required water temperature
You may need to upgrade your gas line which can
add to your upfront costs
Takes longer to deliver hot water than a storage
heater
Save space with a small footprint mounted on your
wall
They heat water as you need it, so you will never run
out of hot water
Controllers can be installed to accurately deliver the
required water temperature
You may need to upgrade your gas line which can add to
your upfront costs
Takes longer to deliver hot water than a storage
heater
Always use a licensed plumber when installing a hot water system.
Gas - Continuous Flow Hot Water Systems
The R-Series range now includes the 17R, 21R, and 26R 50°C and 60°C models, alongside the existing large-capacity 32R model available in both 50°C and 60°C options. The range provides sizing flexibility for applications big, small, and everything in between.
Across the 17R, 21R, and 26R models, the water and plumbing connection layout is consistent - and aligned with the connection positions used by major non-condensing brands on the market. This makes replacements faster, cleaner, and simpler for installers.
The 26R model delivers an equivalent energy efficiency rating of 6.4 stars*, and its low minimum flow rate makes it an ideal match for water-efficient 6-star tapware.
All models are available in both natural gas and LPG, and come backed by a 12 year heat exchanger warranty and 3 year parts and labour coverage.
* The Thermann 26R has the lowest annual energy consumption of any non-condensing 26L/min continuous flow model in the Australian market
1. A hot water tap is turned on
2. Water enters the heater
3. The water flow sensor detects the water
flow
4. The computer automatically ignites the
burner
5. Water circulates through the heat
exchanger
6. The heat exchanger heats the water to the
designated temperature
7. When the tap is turned off, the unit shuts
down
| Features | 17L | 21L | 26L | 32L |
|---|---|---|---|---|
| No. of Outlets | 2 | 2-3 | 3 | 4 |
| Energy Rating (stars) | 6.0 | 6.1 | 6.4 | 5.8 |
| Capacity at 25⁰C rise (L/min) | 17 | 21 | 26 | 32 |
| Capacity at 40⁰C rise (L/min) | 11 | 13 | 16 | 20 |
| Gas Type Available | NG, LPG | NG, LPG | NG, LPG | NG, LPG |
| Measurements | 17L | 21L | 26L | 32L |
|---|---|---|---|---|
| Nominal hourly gas consumption (MJ/h) |
125.5 (NG) 127 (LPG) |
159 | 195 | 250 |
| Test point pressure NG (kPa) | 0.61 | 0.62 | 0.69 |
0.25 (Min) 0.70 (Max) |
| Test point pressure LPG (kPa) | 0.71 | 0.77 | 0.87 |
0.49 (Min) 1.51 (Max) |
| Minimum water pressure (kPa) | 200 | 200 | 200 | 200 |
| Maximum water pressure (kPa) | 1000 | 1000 | 1000 | 1000 |
| Minimum gas inlet pressure NG (kPa) | 1.13 | 1.13 | 1.13 | 1.13 |
| Minimum gas inlet pressure LPG (kPa) | 2.75 | 2.75 | 2.75 | 2.75 |
| Maximum gas inlet pressure NG (kPa) | 3.0 | 3.0 | 3.0 | 3.0 |
| Maximum gas inlet pressure LPG (kPa) | 3.5 | 3.5 | 3.5 | 3.5 |
| Minimum flow rate ignition (L/min) | 1.5 | 1.5 | 1.5 | 2.0 |
| Input voltage single phase 50HZ (v) | 230 - 240 | 230 - 240 | 230 - 240 | 230 - 240 |
| Maximum output current (A) | 0.44 | 0.44 | 0.54 | 0.6 |
| Inlet gas connection male thread | R3/4" (20mm) | R3/4" (20mm) | R3/4" (20mm) | R3/4" (20mm) |
| Cold water connection male thread | R3/4" (20mm) | R3/4" (20mm) | R3/4" (20mm) | R3/4" (20mm) |
| Relief valve pressure setting (kPa) | 1620 | 1620 | 1620 | 1620 |
| Weight dry (kg) | 14 | 15 | 16 | 30 |
| Dimensions (DxWxH mm) | 170x350x520 | 170x350x520 | 170x350x520 | 240x464x615 |
| Product Name | Number of Outlets | Delivery Capacity (At 25 Deg C Rise) | Gas Type | Temperature Setting | Gas Consumption | ||||||||||||||||||||
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| Thermann 17R |
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| Thermann 21R |
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| Thermann 26R |
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| Thermann 32R |
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