Guides & Instructions / Diagnostic Water Test

Diagnostic Water Test

The Diagnostic Water Test is a comprehensive app-based postal laboratory test for heating system water.

Once the sample has completed laboratory testing, the system will generate a PDF certificate which will be automatically sent to the user that submitted the sample in the mobile application. All the submissions will be stored in your account, so you can access them whenever you want from the mobile application and web portal.

The Diagnostic Water Test includes two sample bottles:

Heating system Water (labelled with a QR code and a unique kit reference “DWT#########” )
Fill Water

Full Product Information

Adding new Diagnostic Water Test

After downloading the App and completing registration, you can start adding a ‘New Diagnostic Water Test’.

Fill one sample bottle with Fill Water (usually mains/ city water), then fill the second bottle with Heating System Water. (Please secure the bottle lids to avoid spillage in transit.)

1. Open the app and from the dashboard click on the Scan Icon button

2. On the text selection pop-up, select New Postal Test

Use your smartphone camera to scan the QR code. The QR code matches the unique kit reference which is required to process your water sample.

1. Kit Reference: This code is automatically generated and imported

2. Customer Reference: Enter your own reference against this unique test for reporting purposes.

3. Project Reference: This field allows you to enter your own reference.

4. Company Name: This field allows you to enter the company name.

5. Address*: Select ‘address finder’, enter the property postcode, then select the address from the dropdown which will automatically populate the other address fields OR choose from Saved addresses

1. System Type: Specify the system being tested.

2. System Age: Select one of the following: 0 – 2 years, 2 – 10 years, Over 10 years.

3. Heat Appliance Manufacturer: Select a manufacturer from the dropdown, search for it in the search box, or manually enter a new one if a match is unavailable.

4. Heat Appliance Serial Number: Use your smartphone camera to scan the QR / barcode or entry it manually in case is not easy to access. TIP: This field is critical when working in relation with the boiler manufacturers directly, but also can be useful for reporting.

1. Heat Appliance Age: Select one of the following: 0 – 2 years, 2 – 10 years, Over 10 years.

2. Inhibitor Protector Used: Select the inhibitor used from the dropdown, search for it in the search box, or manually enter a new one if a match is unavailable.

3. Reason for Sampling:

4. When all fields are complete, you can click on ‘Submit’ which will complete the process of adding a new sample.

Final Steps

For UK submissions:

Once the test has been submitted, place the sample bottle back in the box and then in the return envelope. (If you submit multiple samples, each pair of samples is in a separate envelope.)

Results will be available on the mobile app, on the web portal and via email with the results PDF attached within 2 working days of receipt of the sample at the Fernox laboratory.

For Europe and North America submissions:

Click here for postage instructions

Useful Resources

Discover our new Fernox App

Visit this comparison page to find the most appropriate test for you.

Explore country-specific availability of Fernox water tests.

Find authorized retailers and stockists in your area.

Help & FAQs

Can't find an answer to your question?

We are continuously adding more guides and FAQ’s to help you set up on the Fernox App, however if you are unable to find an answer to your question, it’s time to reach out.

Contact Support for assistance, and we’ll help resolve the issue promptly.

Diagnostic Water Test

Final Steps

For UK submissions:

For Europe and North America submissions:

Useful Resources

Help & FAQs

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