Powermax 155 engineer in South London area Jun 21, 2014 9:20:06 GMT -5 Quote Select PostDeselect PostLink to PostBack to Top Post by luke3917 guest on Jun 21, 2014 9:20:06 GMT -5 Hello. Looking for Powermax 155 engineer to solve my power max low water pressure and tepid warm water. Mike has mentioned that power flushing the HE plate will do the trick.