Prior to executing a Hydromx® installation in accordance with this Installation Instructions a valid purchase or trial agreement with associated terms and conditions must be in place between the customer and an authorized reseller or an agent of an authorized reseller. Installation or use of Hydromx® without a valid agreement and/or non compliance with these Installation Instructions shall void any warranty given by the manufacturer Warranty. This work should be carried out by a qualified plumber or heating engineer who has read these instructions