The cold feed pipe to the cylinder is often joined in close to the cylinder inlet. This means this pipe stays warm. Also to reduce 60deg down to 55 you only need a really low flow. So a pipe at perfect legionella breeding temp that only has a really low flow. And the mix outlet temp is not hot enough to instantly kill Legionella. And there are alot of tempering valves out there that are set to 50deg outlet temp by default. (as that is what is required in Australia).
Also if you put a tempering valve really close to the taps you need a fast acting one that costs double the price. As normal ones cause a temp spike when the hot arrives. You need at least 2.5m of pipe on the outlet of a cheap tempering valve to avoid the temp spike issue.
The person with the wetback can easily adjust their tempering valve to output 60deg if they are worried about legionella. Then no worries about damaging pipework due to too much temp.
skin1235,
Oct 10, 8:44am
hell no, I wouldn't have a tempering valve fitted, if the cylinder blew its tits and had to be replaced the bylaws say one must be fitted and it must be fitted by a plumber - he'd better weld it onto the cylinder if he expects it to last longer than it takes to back out the drive
and even if he welded it the cold water inlet feed has to be still connected to work right? cos if I couldn't get the valve off the infeed cold would be either cut or choked asap
lythande1,
Sep 5, 3:49pm
Legionnaires' disease is a severe form of pneumonia ??
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