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The Vaillant aquaPLUS is a combination boiler that is not in production  Please check the frequently answered questions below for any help you may need. You can also click here to visit the appliance homepage.  




What kind of appliance is it?

This appliance is a Combination boiler (combi) with an integrated 15 litre store. This means it heats water when you draw a tap. It doesn't need a external water storage tank or a cylinder because the boiler's connected directly to the water mains, heating water as its needed.

When was the boiler manufactured?

This boiler was first manufactured from 2002 to 2008 and this particular model is no longer being produced. Our later combination boilers that had integrated storage were the ecoTEC 937 and ecoTEC 938.

Is there a clock or roomstat available?

A broad range of Vaillant thermostats and clocks are available. You can find technical help on these by typing in your model into the question bar above or by browsing through our homepage here.

What is the recommended water pressure?

Your boiler should be pressurised to between 1 to 1.5 bar. You can use the user manual for detailed instructions on how this is checked.

How do I top up the water pressure?

You can find help in topping up your water pressure by clicking here. You can also find more information by downloading and checking the user manual below as well as on our Youtube Channel.

How do I adjust the Central heating temperature?

Please check the user manual link below for intructions.

My boiler has a fault and I need some help?

Your boiler should work reliably for a number of years if it is serviced annually, however occasionally faults can occur. In a lot of cases faults can be temporary and if the boiler is reset it will start working again. You can find out how to do this by selecting the user manual below (under available literature). We have created a special troubleshooting guide which you can access by clicking here which may help you resolve the issue. If you continue to experience problems please click here for contact information.

I am an Engineer. I would like technical information. Where can I get it from?

If you are a suitably qualified Gas Safe registered Engineer you can access our comprehensive technical help section by clicking here.


Available Literature


Combi Installation & Servicing Manual User Manual

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