heatrae sadia 25l 9004010.

[Matt0029]

Thanks yes the draw off are all lower the the unit. Breather pipe has tundish on it.

 

[John.g]

Maybe worth checking that for scale build up, if its restricted then the flow from any hot tap will be restricted as well except its just a pure vent pipe,, any photo or description of the unit?.

 

[Ben-gee]

Check the breather pipe for blockage, kink, hernia.
If air can’t get into the unit - water can’t get out.

 

[Matt0029]

Check the breather pipe for blockage, kink, hernia.
If air can’t get into the unit - water can’t get out.

Thanks I think there is a filter in the breather pipe. But there isn't much distance between the bottom of the unit and the hot taps. Only 1meter tops. So 0.1bar.

 

[John.g]

I have a upstairs "1/2" cartridge tap gravity fed from ~ 0.25M that flows 4.0LPM, so if the water level in your cylinder is, say 0.15M above the tap then you might expect ~ 3.0/3.1LPM.

 

[Matt0029]

The distance between the base of the cylinder and the hot tap outlet is around 1meter. So this would give 0.1 bar pressure. What flow rate would this likely give?

 

[John.g]

Maybe 2.0 to 2.5 LPM based on my tap.qqqqqqqqqq 50 chacters to post

 

[Matt0029]

Thanks I don't think it is that at the moment. Possibly abit of an airlock/ breather pipe blockage.

 

[Matt0029]

If it does flow at a decent enough level. If were to fit dual flow taps. Doesn't mix in tap mixes after leaves the spout. Would single checks not be needed to avoid back flow

 

[John.g]

Probably not, I have a d/stairs mixer like that where it mixes in the spout, 3.0bar cold & 0.5bar Hot gravity, no problems.