Originally Posted by Tom48
That has been my experience as well. Wound up replacing a 40 WH last year when a presure relief valve started leaking and could not be removed and replaced due to design. DW can open a hot water faucel while I run around doing outside setup stuff.
Since WMTIRE is seldom, if ever, wrong I have to reconsider that maybe mine failed from lack of being purged and cleaned regularly. But still use caution because if it does not re seat, then it can be a nasty job getting the old one out to but in a new one.