How can we help?

Having trouble? Click here to access our troubleshooting guide.

Your Question:

ecoTEC plus 937 (2012 - 2015)



The Vaillant ecoTEC 937 boiler is a high efficiency boiler that is not currently in production (although there is a refreshed model). 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). This means it heats water when you draw a tap. It doesn't need a 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 2012 to 2015 and this particular model is no longer being produced. A later model has a modulating pump and is ErP rated, which is called the Vaillant 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. 

How do I top up the water pressure?

You can find help in topping up your pressure by typing in your boiler model and "low pressure" into the question bar above as well as clicking here. You can also find more information by checking the user manual as well as checking our Youtube Channel. This image may also help:

How do I adjust the Comfort Mode settings?

This boiler has a built in hot water storage cylinder. The cylinder will only recharge if the comfort mode is switched on. If comfort mode is switched off the cylinder will be cold and this will mean there we be less of a flow of hot water to your taps.

How do I adjust the Central heating temperature?

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

Were we able to answer your question(s)?