Customer FAQ's / Troubleshooting
Here you'll find our most frequently asked questions specific to the end users of our appliances.
General Product
I have misplaced the instructions for my appliance. How do I obtain another copy?
Where is the most suitable location to install a Bosch water heater?
Is a state based form of Compliance Certificate required for all installations of a Bosch water heater?
Must a plumber install a Bosch hot water heater?
Are Bosch hot water units suitable for all water conditions?
The water heater temperatures and flow fluctuate, what does this mean?
Are Bosch water heaters solar compatible?
Can Bosch advise if an internal or external water heater would best suit my location?
Where can I purchase Bosch hot water heaters?
My hot water unit is not operating satisfactorily. What should I do?
General Service & Warranty
What is covered by the manufacturer’s warranty?
What is the warranty period on my Bosch hot water heater?
What support does Bosch provide to assist with my problem?
Should Bosch Hot Water heaters be inspected and serviced?
I would like to have a safety check and service on my Bosch hot water unit. Who is the most suitable person to service my appliance?
What inspections should the hot water user/consumer do on the appliance?
Can the home-owner/end-user perform a service on the Bosch water heater themselves?
What should I do if I have an issue with the performance of my water heater and it is within the warranty period?
We appear to be using more gas than expected. What can we check?
I have had a problem with my water heater, and the service technician says it was caused by vermin. What can I do?
Does the quality of the water effect the operation of the Bosch appliances?
Where can my plumber buy spare parts from?
The plumber needs to identify the spare part and part number. How can you assist?
Does the spare part come with a warranty?
Hydronic Heating Boilers
Does my boiler require servicing?
Does the water in my heating system require treatment?
The heating system is constantly losing pressure, what should I do?
What is the white smoke (pluming) coming from the flue?
What do the fault codes mean on my boiler?
What is a thermostatic radiator valve (TRV)?
My boiler is producing a 'gurgling' sound what could be the cause?
What is hydronic heating?
What are the benefits of Hydronic Heating?
What is a combi boiler?
Why important to go through a registered boiler installer?
My boiler isn’t turning on, is there anything I can do?
OptiFlow / HighFlow Models
Does Bosch still sell the Optiflow / Highflow water heater?
I’ve lost the owner’s manual, where can I get a replacement?
Are Bosch OptiFlow / HighFlow water heaters suitable with all tapware?
How long should it take for hot water to arrive at the hot water tap?
My OptiFlow / HighFlow water heater is not lighting. Is there anything I can check before I call a plumber?
Is the power required to be left on when the OptiFlow / HighFlow not in use?
I have a Bosch water heater which is locked at 50°C. Can this temperature be increased?
What is pre-set 50°C?
What temperature will the Bosch OptiFlow / HighFlow System supply?
My Bosch Optiflow unit makes noise while not operating, is this normal?
If the unit is faulting can I check the fault code?
How can I reset the Bosch OptiFlow or HighFlow products?
My water heater temperature is fluctuating, is this covered by warranty? Can I perform any checks prior to booking a service call?
What is covered by warranty? Will I be charged if there is no manufacturing fault with the product?
What is the warranty period for the Optiflow / Highflow unit?
My water heater is not supplying hot water after the LPG cylinder was replaced?
I’m experiencing difficulties with the operation of my water heater. What should I do?
My Bosch Optiflow unit has Bluetooth connectivity. How do I connect?
Can any plumber / service tech inspect my Bosch Optiflow unit?
External Hydropower Models
What does Hydropower mean?
Do you need power to operate the unit?
Does the water heater require a minimum flow rate to operate?
I've lost the owner's manual, where can I get a replacement?
How do I adjust the temperature of the Hydropower water heater?
Is the Hydropower water heater suitable for installation in cold/frost environments?
How do I access the water heater controls?
I’m experiencing difficulties with the operation of my water heater. What should I do?
The water heater has black marks (sooting) around the flue outlet?
I have an issue with the performance of my water heater. The service technician was advised it was caused by vermin. What can I do?
Can a temperature controller be used?
How long should it take for hot water to arrive at the fixture?
Should I run out of hot water?
Can tempering valves be used with Hydropower products?
What is the warranty period for the external Hydropower unit?
Is the Hydropower product suitable for solar?
Water is leaking from the unit, what do I do?
Pilot Ignition Models
I’ve lost the owner’s manual, where can I get a replacement?
How to light the pilot light?
How do I adjust the temperature of the hot water?
The unit is fluctuating in temp, what should I do?
How long should it take for hot water to arrive at the fixture?
Should I run out of hot water?
Pilot light will not stay alight. What do I do?
The pilot keeps going out. What can I do?
I’m experiencing difficulties with the operation of my water heater. What should I do?
Do I need to maintain my instantaneous water heater?
My unit is connected to an 9kg Gas cylinder
What is the Warranty period of these units?
I have an issue with the performance of my water heater. The service technician was advised it was caused by vermin. What can I do?
The water heater has black marks (sooting) around the flue outlet?
Is the Pilot Range product suitable for solar?
Can a temperature controller be used?
Is the pilot model water heater suitable for installation in cold/frost environments?
Can tempering valves be used with the Pilot Range products?
Water is leaking from the unit, what do I do?
Internal Compact Hydropower Models
I've lost the owner's manual, where can I find a replacement?
What does Hydropower mean?
Do you need power to operate the unit?
Does the water heater require a minimum flow rate to operate?
How can I adjust the temperature of the Internal Compact unit?
Where can the internal compact be installed?
What fluing can be installed on an internal compact?
Does the fluing need to be installed vertically?
Does the Internal Compact hot water unit require a minimum length of flue to be installed?
I have issues with the performance of my Internal Compact when it rains?
I have an issue with the performance of my water heater. The service technician has advised it was caused by vermin. What can I do?
What should we do if the water heater doesn’t operate within the normal expected period?
The Internal Compact unit is displaying a code, what does this mean?
I’m experiencing difficulties with the operation of my water heater. What should I do?
Can a temperature controller be used?
How long should it take for hot water to arrive at the fixture?
Can tempering valves be used with Hydropower products?
I’m the installing plumber. How do I commission the water heater?
Water is leaking from the unit, what do I do?
Heat Pump
How do I set the time and date on the heat pump?
How do I operate the heat pump on a program?
How long should my heat pump take to heat the water?
Can the heat pump be electric boosted?
I have a fault with my heat pump and would like hot water, is there an emergency back up?
Is it normal for the heat pump to leak water?
Can the Controller of the heat pump be reset?
How often should the heat pump be serviced?
The heat pump is showing an error code, what can I do?
Does water quality effect the performance of the heat pump?
Can a Bosch Heat Pump be connected to a ring main plumbing system?
My Bosch Heat Pump continues to show LEG, What does this mean?
LPG Gas Supply
My Bosch Highflow / Optiflow is connected to LPG and when I run out of gas I have to reset the water heater. Is this normal?
What size LPG cylinders do I need?
Is it better to use an auto changeover or manual changeover regulator when my Bosch hot water unit is connected to LPG cylinders?
My water heater is not supplying hot water after the LPG cylinder was replaced?