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Moffski72

Moffski72
Gas Engineer
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Anyone had one o these (mira mode thermo mixer) getting crossflow from cold into the hot? Tia
 
If the nrv is stuck open / broken yes very easily esp with higher pressure on the cold
 
no check valves on these...spoke to mira and they said they dont need em coz of the way the valve is designed...also its on a combi so equal pressures, give or take...
 
theres your problem if there not equal

best to check hot and cold pressures
 
Eh? Why would they not be equal pressures if it's a combi feeding the shower...?? They're both at whatever the mains pressure is. The hot might be slightly reduced through the plate I spose, but there's millions of mixers run off combis?
 
Moffski72 said:
Eh? Why would they not be equal pressures if it's a combi feeding the shower...?? They're both at whatever the mains pressure is. The hot might be slightly reduced through the plate I spose, but there's millions of mixers run off combis?
Click to expand...

thats the only way they could cross
 
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