Thermann Hot Water System Price 2026
Thermann hot water systems cost $998 to $9,230 for the unit alone, across 33 models we checked at Australian retailers on 13 October 2026. That covers Thermann gas storage, R-Series, G-Series and C7 continuous flow, electric storage, integrated heat pumps and gas or electric boosted solar. Installation is extra, and the type you choose matters more than the badge: it sets both the upfront price and what you pay to run it every year.
These are unit prices. Get up to 3 installed quotes for a Thermann or a better-value alternative, rebates applied.
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Electric storage (12 models)
Gas storage (2 models)
Gas continuous flow (11 models)
Heat pump (2 models)
Solar (6 models)
Retail prices including GST, before installation and before any rebate, from Hot Water Boss, Hot Water Shop. Checked 13 October 2026; retailer prices change often.
Every Thermann Model We Priced
Each price links to the retailer listing it came from. Sizes are tank capacity in litres, or flow rate in litres a minute for continuous flow units.
Thermann electric storage: $1,040 to $2,255
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Thermann 125THM1 125 Litres Electric | 125 L | $1,040 | Hot Water Shop |
| Thermann 125L Single Element Electric (1.8kW) | 125 L | $1,065 | Hot Water Boss |
| Thermann 125L Single Element Electric (3.6kW) | 125 L | $1,065 | Hot Water Boss |
| Thermann 160L Single Element Electric (3.6kW) | 160 L | $1,135 | Hot Water Boss |
| Thermann 250L Single Element Electric (3.6kW) | 250 L | $1,268 | Hot Water Boss |
| Thermann 250THM1 250 Litres Electric | 250 L | $1,420 | Hot Water Shop |
| Thermann 315L Single Element Electric (3.6kW) | 315 L | $1,430 | Hot Water Boss |
| Thermann 250L Twin Element Electric (3.6kW) | 250 L | $1,565 | Hot Water Boss |
| Thermann 315THM1 315 Litres Electric | 315 L | $1,620 | Hot Water Shop |
| Thermann 315L Twin Element Electric (3.6kW) | 315 L | $1,841 | Hot Water Boss |
| Thermann 400L Single Element Electric (3.6kW) | 400 L | $2,065 | Hot Water Boss |
| Thermann 400L Twin Element Electric (4.8kW) | 400 L | $2,255 | Hot Water Boss |
Typical running cost for this type: $1,200 - $1,800 a year (household estimate).
Thermann gas storage: $1,415 to $1,690
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Thermann External 135L 4-Star Natural Gas - 135THMB4N | 135 L | $1,415 | Hot Water Boss |
| Thermann External 170L 4-Star Natural Gas - 170THMB4N | 170 L | $1,690 | Hot Water Boss |
Typical running cost for this type: $800 - $1,200 a year (household estimate).
Thermann gas continuous flow: $998 to $2,848
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Thermann R-Series 17L 60°C continuous flow | 17 L/min | $998 | Hot Water Boss |
| Thermann 17R 50°C continuous flow | 17 L/min | $998 | Hot Water Boss |
| Thermann R-Series 21L 60°C continuous flow | 21 L/min | $1,115 | Hot Water Boss |
| Thermann 21R 50°C continuous flow | 21 L/min | $1,115 | Hot Water Boss |
| Thermann G-Series 16L 60°C continuous flow | 16 L/min | $1,145 | Hot Water Boss |
| Thermann G-Series 20L 60°C continuous flow | 20 L/min | $1,220 | Hot Water Boss |
| Thermann R-Series 26L 60°C continuous flow | 26 L/min | $1,235 | Hot Water Boss |
| Thermann G-Series 26L 60°C continuous flow | 26 L/min | $1,315 | Hot Water Boss |
| Thermann 26R 50°C continuous flow | 26 L/min | $1,335 | Hot Water Boss |
| Thermann C7 26L 60°C continuous flow | 26 L/min | $1,495 | Hot Water Boss |
| Thermann 32R 50°C continuous flow | 32 L/min | $2,848 | Hot Water Boss |
Typical running cost for this type: $800 - $1,200 a year (household estimate).
Thermann heat pump: $3,785 to $3,985
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Thermann Integrated Heat Pump 200L R290 2.6kW | 200 L | $3,785 | Hot Water Boss |
| Thermann Integrated Heat Pump 285L R290 2.6kW | 285 L | $3,985 | Hot Water Boss |
Typical running cost for this type: $200 - $400 a year (household estimate).
Thermann solar: $7,060 to $9,230
| Model | Size | Unit price | Retailer |
|---|---|---|---|
| Thermann 250L Gas Boosted Solar | 250 L | $7,060 | Hot Water Shop |
| Thermann 315L Gas Boosted Solar | 315 L | $7,530 | Hot Water Shop |
| Thermann 250L Electric Boosted Solar | 250 L | $8,580 | Hot Water Shop |
| Thermann 315L Electric Boosted Solar | 315 L | $8,960 | Hot Water Shop |
| Thermann 400L Electric Boosted Solar | 400 L | $8,990 | Hot Water Shop |
| Thermann 400L Gas Boosted Solar | 400 L | $9,230 | Hot Water Shop |
Typical running cost for this type: $150 - $400 a year (household estimate).
What a Thermann Costs Installed
The unit is only part of the bill. A licensed plumber (and an electrician for some jobs) removes the old system, fits the new one and handles compliance. For a straight swap, the Yellow Pages Australia hot water cost guide (updated May 2026) puts labour at $500 - $800 (swap an electric storage unit for another) and $300 - $700 (swap a gas unit for another). Changing type costs more, because it can mean new wiring, a new circuit or moving the system.
- Thermann 6-Star 16L Instant Gas (16 L/min): $1,749 installed from JR Gas & Water
- Thermann 125L Electric (125 L): $1,799 installed from JR Gas & Water
- Thermann 4-Star 135L Gas (135 L): $2,549 installed from JR Gas & Water
- Thermann 250L 22xET Solar (250 L): $9,299 installed from JR Gas & Water
Advertised like-for-like packages, each with the retailer's own conditions and service area. Checked 13 October 2026.
For installed prices by system type across Australia, see what a hot water system replacement costs.
Is a Thermann Heat Pump Worth the Extra?
A Thermann heat pump costs more to buy ($3,785 to $3,985 for the unit) but is far cheaper to run than electric or gas, at around $200 - $400 a year against $1,200 - $1,800 for electric storage. Federal certificates typically take $500 - $800 off at the point of sale, and several states add a rebate on top, which closes much of the gap.
Replacing gas in Victoria? From 1 March 2027, Victorian law requires a mains gas hot water unit that fails in an existing home to be replaced with an electric one. Limited exemptions apply, for example where there is no room for an electric unit. See what replacing gas hot water in Victoria costs.
Frequently Asked Questions
How much does a Thermann hot water system cost?
Thermann hot water systems cost $998 to $9,230 for the unit alone at Australian retailers, across the 33 models we checked on 13 October 2026. Electric storage $1,040 to $2,255; gas storage $1,415 to $1,690; gas continuous flow $998 to $2,848; heat pump $3,785 to $3,985; solar $7,060 to $9,230. Installation is extra.
What is the cheapest Thermann hot water system?
The cheapest Thermann unit we found was the Thermann R-Series 17L 60°C continuous flow (17 L/min) at $998 from Hot Water Boss, supply only. The cheapest to buy is rarely the cheapest to own: running costs differ by hundreds of dollars a year between system types.
How much does it cost to install a Thermann hot water system?
For a straight swap, installation labour typically runs $500 - $800 (swap an electric storage unit for another) and $300 - $700 (swap a gas unit for another), according to the Yellow Pages Australia hot water cost guide (updated May 2026). Retailer installed packages we checked for Thermann ranged from $1,749 to $9,299. Switching type, for example gas to a heat pump, usually adds electrical and plumbing work, so get a quote for your home.
How much is a Thermann heat pump hot water system?
Thermann heat pumps cost $3,785 to $3,985 for the unit at the retailers we checked. Federal small-scale technology certificates typically take $500 - $800 off the price, usually as a point-of-sale discount from the installer, and some states add more on top.
Can I replace a gas Thermann hot water system with another gas one in Victoria?
Until 28 February 2027, yes. From 1 March 2027, Victorian regulations stop plumbers installing a new mains gas water heater in an existing home, including replacing a failed one, with some exemptions. Most Victorian households replacing mains gas hot water will need an electric option such as a heat pump.
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