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 is the seasonal efficiency of the Wessex ModuMax mk3 boiler? FORS Delivery What size expansion vessel do I need for a Powerstock Calorifier PS300? Will the Wessex ModuMax boiler operate with an open vented system? Comments 0 comments Please sign in to leave a comment.