NO MAINS POWER REQUIRED
Bosch HydroPower 16H External Natural Gas Continuous Flow Hot Water System
The Bosch HydroPower 16H is an external mechanical continuous-flow gas water heater that uses water flow to generate the low-voltage electricity required for ignition.
This natural-gas model is identified by Bosch as TF400-8GNG, part number 7716482601. It delivers up to 16 litres per minute at a 25°C temperature rise under the manufacturer's stated operating conditions.
Because the HydroPower ignition system generates its own ignition energy, the appliance does not require a 240V power point or batteries and does not use a continuously burning standing pilot.
Installed Today can offer the Bosch 16H as supply only, or through eligible supplied-and-installed pathways in Brisbane and Gold Coast service areas where the existing natural-gas service, water supply and external installation position are suitable.
Bosch HydroPower 16H at a glance: external natural-gas continuous flow, 16L/min at a 25°C temperature rise, HydroPower ignition, no mains electrical connection, 5.0-star gas rating, 130MJ/h maximum gas consumption, 50kPa minimum inlet-water pressure, 800kPa maximum inlet pressure, 25kg appliance weight and a 10-year domestic heat-exchanger parts warranty.
CURRENT BOSCH MODEL
What Is the Bosch HydroPower 16H?
The HydroPower 16H is the largest of Bosch's current 10H, 13H and 16H external mechanical HydroPower models.
Unlike an electric-ignition continuous-flow system, it uses a small hydrogenerator driven by water flow. Opening a suitable hot-water outlet causes water to pass through the unit, the hydrogenerator produces the low-voltage electricity needed by the ignition system, and the gas burner lights.
When hot-water demand stops, the burner shuts down.
The HydroPower range remains listed by Bosch within its current Australian residential hot-water range.
MODEL IDENTIFICATION
What Is the Natural Gas Model Number?
Model
TF400-8GNG identifies the Bosch 16H external HydroPower natural-gas model.
Part Number
7716482601 is Bosch's current catalogue part number for the external natural-gas 16H.
Bosch also manufactures a separate LPG 16H variant. Always confirm the gas type on the appliance rating plate before installation.
FLOW RATE
What Does 16 Litres per Minute Mean?
Bosch rates the 16H at up to 16L/min when the required water-temperature rise is 25°C.
A continuous-flow rating must always be read together with its temperature rise. If the incoming water is colder and a larger temperature increase is required, the maximum available flow reduces.
| Manufacturer Operating Condition | 16H Water Flow Range |
|---|---|
| Approximately 25°C Temperature Rise | Up to 16L/min |
| Approximately 50°C Temperature Rise | Up to approximately 8L/min |
16L/min is not a guaranteed flow at every water temperature. Colder incoming water and a higher required outlet temperature increase the temperature rise and reduce the available hot-water flow.
HOUSEHOLD SUITABILITY
Who Is the Bosch HydroPower 16H For?
Bosch does not publish a fixed household occupant rating for the 16H in its current Australian technical table.
The appropriate application should instead be assessed from the required simultaneous hot-water flow, local incoming-water temperature and the number and type of outlets expected to operate together.
Gas Continuous Flow Replacement
Particularly relevant where an existing external natural-gas continuous-flow system is being replaced in a compatible location.
No Nearby Power Point
Useful where the installation does not have a suitable mains outlet and a mechanical HydroPower water heater meets the property's other requirements.
Moderate Flow Demand
The 16L/min nominal rating can suit properties whose simultaneous hot-water requirements fit within the unit's temperature-rise performance.
PRODUCT AT A GLANCE
Bosch HydroPower 16H Key Details
16L/min
At 25°C Rise
5.0 Star
Gas Rating
130MJ/h
Maximum Gas Input
25kg
Unit Weight
HYDROPOWER IGNITION
How Does Bosch HydroPower Ignition Work?
The appliance contains a hydrogenerator within the water path.
When sufficient hot-water flow passes through the system, the hydrogenerator creates a small electrical voltage that powers the ignition system.
This means the unit does not depend on mains electricity for normal ignition and does not require replacement ignition batteries.
- No 240V power point required at the appliance
- No ignition batteries required
- No standing pilot flame
- Ignition energy generated from water flow
- Burner operates when hot water is demanded
MINIMUM FLOW
Does the HydroPower System Need a Minimum Water Flow?
Yes. Sufficient water flow is essential because the hydrogenerator and mechanical water controls need flow through the appliance before the burner can operate correctly.
Bosch's current Australian catalogue lists a minimum flow of approximately 3.5L/min for the HydroPower range.
Very low-flow tapware, blocked aerators, restrictive shower heads or inadequate property pressure can prevent reliable activation or contribute to fluctuating outlet temperatures.
This is important with water-saving fixtures. If an outlet cannot provide enough flow through the heater, the appliance may not activate consistently even though the water supply itself is connected.
TECHNICAL SPECIFICATIONS
Bosch HydroPower 16H Natural Gas Specifications
| Specification | Bosch 16H External NG |
|---|---|
| Brand | Bosch |
| Range | HydroPower |
| Model | TF400-8GNG |
| Part Number | 7716482601 |
| Gas Type | Natural gas |
| Installation | External only |
| Ignition | HydroPower hydrogenerator |
| Mains Electricity Required | No |
| Standing Pilot | No |
| Gas Energy Rating | 5.0 stars |
| Maximum Flow at 25°C Rise | 16L/min |
| Minimum Listed Operating Flow | Approximately 3.5L/min |
| Minimum Inlet Water Pressure | 50kPa |
| Minimum Constant Pressure for Maximum Rated Flow | 130kPa in Bosch's current catalogue |
| Maximum Inlet Water Pressure | 800kPa |
| Maximum Gas Consumption | 130MJ/h |
| Natural Gas Supply Pressure During Operation | 1.13kPa manufacturer commissioning value |
| Dimensions | Approximately 936mm H x 460mm W x 265mm D |
| Weight | Approximately 25kg |
| Natural Gas Connection | 20mm |
| Cold Water Connection | 15mm |
| Hot Water Connection | 15mm |
| Domestic Warranty | 2 years parts and labour; heat exchanger 10 years part only |
WATER PRESSURE
What Water Pressure Does the Bosch 16H Need?
Bosch's current product catalogue lists a 50kPa minimum inlet-water pressure for the 16H and a 130kPa minimum constant pressure for maximum rated flow.
The maximum permissible static inlet pressure is 800kPa.
Actual performance can still be affected by pressure losses through pipework, fixtures, regulators and other restrictions between the water main and the heater.
HIGH WATER PRESSURE
What If the Property Has More Than 800kPa Water Pressure?
Bosch's HydroPower installation instructions specify a 500kPa pressure-limiting valve where incoming pressure exceeds 800kPa.
The manufacturer also states that where this pressure-limiting valve is positioned less than approximately three metres from the appliance, a 700kPa cold-water expansion valve is required between the heater and the pressure-limiting valve.
Valve kits need to suit the Bosch installation instructions. The final cold-water inlet arrangement should be selected by the licensed installer for the actual property pressure and appliance.
COLD-WATER ISOLATION
What Type of Water Isolation Valve Does Bosch Specify?
The Bosch installation manual specifies a gate valve or quarter-turn full-flow ball valve at the cold-water inlet.
The manual specifically warns against using a stop valve, duo valve or non-return valve in that cold-water isolation position.
This is an important model-specific requirement when selecting a replacement valve kit for a HydroPower installation.
GAS SUPPLY
Does the Existing Gas Line Need to Support 130MJ/h?
Yes. The natural-gas 16H has a manufacturer-listed maximum gas consumption of 130MJ/hour.
The existing natural-gas pipework, meter and regulator arrangement must be capable of maintaining the required gas supply while the water heater and other relevant gas appliances are operating.
Bosch requires gas pressure to be checked and adjusted during commissioning.
An existing gas connection does not prove that the gas line is large enough for the 16H. Undersized gas pipework or inadequate supply pressure can cause poor appliance performance and must be rectified before commissioning.
NATURAL GAS ONLY
Is This Bosch 16H Natural Gas or LPG?
This product page is specifically for the TF400-8GNG natural-gas model.
Bosch separately identifies the LPG version as a different product and part number.
The correct gas type must be selected before the appliance is installed.
Bosch does not recommend treating gas-type conversion as the normal installation pathway. Order the factory model that matches the property's gas supply.
OUTDOOR INSTALLATION
Can the Bosch HydroPower 16H Be Installed Indoors?
No. Bosch specifies the HydroPower 16H external model for outdoor installation only.
It must not be installed indoors or within an enclosed space.
The unit is wall mounted and requires unobstructed combustion-air entry and safe discharge of combustion products through its top flue terminal.
INSTALLATION CLEARANCES
What Clearances Does the Bosch 16H Need?
The final position needs to satisfy the current gas-installation requirements together with Bosch's appliance instructions.
Bosch's HydroPower installation guide identifies manufacturer clearance considerations including:
- Top and bottom areas kept clear by at least approximately 300mm
- 500mm guide clearance below eaves or projections for this gas-input class
- 500mm guide clearance from a return wall or external corner
- 500mm horizontally from relevant openable windows or doors
- 1000mm vertically below relevant openings for this gas-input class
- 1500mm from a mechanical air inlet
- 500mm horizontally from an obstruction facing the flue terminal
- Combustion-air openings kept free of plants, debris and insects
The manual describes these dimensions as a guide and requires the actual installation to comply with the applicable gas-installation rules.
WALL MOUNTING
How Is the HydroPower 16H Installed?
The 16H is designed to be fixed vertically to a suitable external wall.
The mounting structure and fixings must support the approximately 25kg appliance weight and remain suitable for the wall construction.
Bosch specifies a maximum installation height of approximately two metres from the ground to the base of the appliance within its current HydroPower installation instructions.
If the water heater is mounted on a combustible surface, the applicable Bosch heat-shield arrangement and manufacturer instructions need to be followed.
TEMPERATURE CONTROL
Does the Bosch 16H Need a Tempering Valve?
The HydroPower can produce outlet water above 50°C.
Bosch's installation manual therefore requires a suitable temperature-limiting device on pipework supplying sanitary fixtures used primarily for personal hygiene.
A suitable tempering valve can be used for this purpose, with the final arrangement determined by the licensed plumber and the property's plumbing layout.
MANUAL WATER TEMPERATURE CONTROL
How Is Water Temperature Adjusted?
The HydroPower is a mechanical continuous-flow water heater rather than a digitally temperature-controlled appliance.
It provides separate user adjustments for gas rate and water flow.
Increasing water flow lowers the temperature rise, while reducing flow increases the temperature rise. The gas-control adjustment also changes burner output.
Because incoming water temperature changes seasonally, the preferred control position can differ between summer and winter.
NO STANDARD POWER POINT
Do I Need an Electrician or New GPO for the Bosch 16H?
The HydroPower ignition system itself does not require a standard 240V power point, so a new GPO is not required simply to operate this appliance.
This can simplify replacement where an older mechanical continuous-flow gas heater is already installed without electrical power nearby.
Any unrelated electrical installation work at the property remains outside the appliance requirements.
FROST CONDITIONS
Can the HydroPower 16H Be Used in Frost-Prone Areas?
Bosch states that external HydroPower models can be installed where occasional frost occurs for short periods, but its specified Exogel frost-protection valve is required for that application.
Where an appliance will be unused for an extended period in freezing conditions, Bosch also advises isolating the water supply and draining the appliance as applicable.
APPLICATION LIMITS
What Is the HydroPower 16H Not Designed For?
Bosch's installation instructions identify several application limits.
- Not for indoor or enclosed installation
- Not intended as a solar hot-water booster
- Not for pool heating
- Not for spa-pool heating
- Not for commercial boosting of warm-water recirculation
- Incoming cold water should remain within the manufacturer's specified range
MAINTENANCE
How Often Should the Bosch HydroPower Be Serviced?
Bosch's HydroPower installation manual specifies servicing approximately every two years to maintain appliance performance and safety.
Maintenance should be completed by appropriately qualified personnel using suitable Bosch replacement parts where required.
The air openings and flue area should also remain free from leaves, debris, insects and other obstructions that could affect combustion.
WARRANTY
Bosch HydroPower 16H Warranty
For qualifying domestic use, Bosch's current warranty information lists:
2 Years Parts & Labour
The external HydroPower appliance receives two years of parts-and-labour coverage under the manufacturer's domestic warranty terms.
10 Years Heat Exchanger
The heat exchanger receives warranty coverage for up to ten years for domestic use. After the standard labour period, the extended heat-exchanger coverage is part only.
Commercial warranty periods differ from domestic use.
Warranty conditions apply. Correct installation, servicing, water quality, gas supply, pressure, appliance access and the manufacturer's warranty requirements can affect coverage.
SUPPLY ONLY
Buy the Bosch HydroPower 16H Supply Only
Choose supply only where you already have appropriately licensed plumbing and gas trades arranged and only require the water heater supplied.
The unit-only price does not automatically include:
- Gas installation labour
- Gas isolation valve or valve kit
- Water-isolation components
- Tempering or temperature-control equipment
- Pressure-control equipment
- Gas-line upgrades
- Additional pipework
- Relocation
- Old-system disposal
- Difficult-access work
SUPPLY & INSTALL
Bosch HydroPower 16H Supplied & Installed
Eligible Brisbane and Gold Coast customers can select a supplied-and-installed pathway where the property and existing services suit the natural-gas HydroPower 16H.
Gas Supply Check
The natural-gas service needs sufficient capacity for the 130MJ/hour maximum appliance demand.
Water Supply Check
Water pressure, flow, isolation valves, temperature control and any required pressure-management components need to suit Bosch's instructions.
External Location Check
The external wall position needs suitable flue clearances, combustion air, mounting support and safe service access.
INSTALLATION AREAS
Bosch HydroPower 16H Installation in Brisbane & Gold Coast
Installed Today can provide supplied-and-installed pathways across eligible Brisbane and Gold Coast service areas where the Bosch 16H and required continuous-flow installation scope are available.
Brisbane
Gold Coast
Additional work can apply where the property requires a new valve kit, gas-line upgrade, additional plumbing, pressure control, temperature control, relocation, difficult access or old-system disposal.
MECHANICAL CONTINUOUS FLOW WITHOUT MAINS POWER
Why Choose the Bosch HydroPower 16H?
The defining feature of the Bosch 16H is its HydroPower ignition system. It can provide externally mounted continuous-flow natural-gas hot water without requiring mains electricity or ignition batteries.
Its current specifications include 16L/min at a 25°C temperature rise, 5.0-star gas efficiency, 130MJ/hour maximum gas consumption, 800kPa maximum inlet pressure and a compact wall-mounted 25kg cabinet.
It is particularly relevant where a compatible older mechanical natural-gas continuous-flow system is being replaced and the existing outdoor location, water supply and gas service suit the new appliance.
COMMON QUESTIONS
Questions About the Bosch HydroPower 16H
What Is the Current Natural Gas Model?
The current natural-gas 16H is TF400-8GNG.
What Is the Bosch Part Number?
The current natural-gas part number is 7716482601.
Is the HydroPower Range Still Current?
Yes. Bosch currently lists the HydroPower series within its Australian residential hot-water range.
Is This Natural Gas or LPG?
This page is specifically for the natural-gas model. Bosch has a separately identified LPG 16H.
What Is the Maximum Flow?
Up to 16L/min at a 25°C temperature rise.
Will It Always Deliver 16L/min?
No. Available flow reduces when a greater temperature rise is required or when supply pressure and plumbing conditions limit flow.
What Is the Approximate Flow at a 50°C Rise?
The Bosch manual lists up to approximately 8L/min under its higher-temperature-rise operating condition.
Does It Need Electricity?
No external electrical supply is required for normal operation.
Does It Need Batteries?
No. HydroPower ignition generates the required ignition electricity from water flow.
Does It Have a Pilot Light?
It does not use a continuously burning standing pilot.
What Is the Gas Rating?
Bosch lists the 16H HydroPower at 5.0 stars.
What Is the Maximum Gas Consumption?
Approximately 130MJ/hour.
What Gas Connection Does It Use?
The current Bosch catalogue lists a 20mm natural-gas connection.
What Size Are the Water Connections?
The hot and cold water connections are listed as 15mm.
What Is the Minimum Flow?
Bosch's current catalogue lists approximately 3.5L/min.
What Is the Minimum Inlet Water Pressure?
The current Bosch catalogue lists 50kPa.
What Water Pressure Is Needed for Maximum Rated Flow?
Bosch's current catalogue lists approximately 130kPa minimum constant water pressure for maximum flow.
What Is the Maximum Inlet Pressure?
800kPa.
What Happens Above 800kPa?
Bosch specifies a 500kPa pressure-limiting valve where incoming pressure exceeds 800kPa, together with the additional expansion-valve arrangement described in its instructions where applicable.
Can It Be Installed Indoors?
No. The TF400-8G HydroPower is an external-only appliance.
What Are the Dimensions?
Approximately 936mm high x 460mm wide x 265mm deep.
How Much Does It Weigh?
Approximately 25kg.
Does It Need a Temperature-Limiting Device?
Where the system supplies personal-hygiene fixtures and outlet water may exceed the permitted delivery temperature, Bosch specifies a suitable temperature-limiting device such as a tempering valve.
Can It Be Used as a Solar Booster?
No. Bosch states that the HydroPower model is not suitable as a solar booster.
Can It Be Used for a Pool or Spa?
No. Bosch identifies pool and spa applications as unsuitable for this appliance.
How Often Should It Be Serviced?
Bosch's HydroPower manual specifies servicing approximately every two years.
What Is the Domestic Warranty?
Bosch lists 2 years parts and labour for domestic external HydroPower installations.
What Is the Heat-Exchanger Warranty?
The heat exchanger is covered for 10 years for domestic use, with the extended period covering the heat-exchanger part only after the standard labour coverage ends.
Can I Buy It Supply Only?
Yes. Supply-only ordering suits customers who already have appropriately licensed plumbing and gas trades arranged.
Can Installed Today Install It?
Eligible Brisbane and Gold Coast properties can select a supplied-and-installed pathway where the natural-gas supply, water pressure, external location and access are suitable.
FINAL CHECK
Is the Bosch HydroPower 16H Right for Your Home?
The Bosch TF400-8GNG HydroPower 16H is primarily suited to properties wanting an external natural-gas continuous-flow water heater that does not depend on mains electricity.
Its defining specifications are 16L/min at a 25°C temperature rise, HydroPower ignition, 5.0-star gas rating, 130MJ/hour maximum gas consumption, 50kPa minimum inlet pressure and 800kPa maximum inlet pressure.
Before ordering, check the gas type, gas-line capacity, water pressure, expected simultaneous hot-water demand, external flue clearances, temperature-control requirements and existing valve arrangement.
For supply only, arrange appropriately licensed installation trades. For eligible Brisbane and Gold Coast properties, select the matching supplied-and-installed pathway and any required valve, gas, plumbing, pressure-control, disposal or difficult-access add-ons before checkout.
Tempering valve information:
Where a hot water system is capable of delivering water above 50°C, a compliant tempering valve must be installed to control the temperature delivered to personal hygiene fixtures such as showers, baths, basins, and bathroom outlets. This helps reduce the risk of scalding and assists with meeting plumbing compliance requirements.
A tempering valve blends hot and cold water to deliver a safer controlled outlet temperature to required fixtures. The hot water unit itself may store water at a higher temperature, but the water delivered to personal hygiene outlets must be controlled where required by plumbing regulations.
If your property already has a suitable, compliant tempering valve installed, your licensed plumber can assess whether it is appropriate for use with the new hot water system. Existing valves may not always be suitable due to age, condition, compliance requirements, valve type, location, or system compatibility.
If a compliant tempering valve is not already installed, or if the existing valve is unsuitable, one must be supplied and installed by a licensed plumber as part of the hot water installation.
Tempering valves are not automatically included with every supply-only hot water unit unless specifically selected, listed as included, or purchased as part of a suitable valve kit. If a tempering valve is required, please purchase the appropriate valve kit with your order or arrange for your licensed installer to supply and install the correct tempering valve on site.
It is the customer’s responsibility to ensure the installation is completed by appropriately licensed trades and that all required valves, fittings, electrical work, plumbing work, and compliance requirements are allowed for as part of the installation.
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Important Installation Note
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