What are the NOx emissions of the Wessex ModuMax mk3 boiler? Hamworthy Heating September 06, 2018 09:47 Updated Follow All NOx emission data is published in the technical data table. This can be found on pages 8-9 of the technical sales brochure or on the 'Technical data' tab on the product page. Download the product brochure. Related articles What size expansion vessel do I need for a Powerstock Calorifier PS300? Comments 0 comments Please sign in to leave a comment.