Water volume calculation !

[bathjobby]

Anyone know the ratio of volume to gallons/litres of water (and for the picky ones, yes, at sea level) ? Want to know what the capacity of my cold water storage tank is before I decide on pumped shower. There are no markings on the tank but I know its dimensions and the depth of water. I should know this but can't recall !

 

[lewy]

1 gallon = 4.546 litres or 1 litre = 0.21997 gallons

 

[bathjobby]

Thanks lewy but I already know the metric to imperial convertion rates, not what I'm looking for.

 

[2scoops0406]

One litre of water measures 10cm x 10cm x 10cm.

 

[lewy]

Yep sorry,

1000 litres = 1M3

 

[bathjobby]

Thanks guys. Must get to grips with this metric stuff it all starts to look so simple compared to imperial, e.g. 1000 ltrs = 1M3, 1ltr (at sea lvl) = 1kg, etc, etc.

 

[ChrisR]

Reckon on 100 litres of actual hot water from a 36 x 18" cylinder. A bit less if you use a proper "flange" (look that up!)

Also reckon on 2 parts hot to one of cold. So at 12 l/min in the shower you get about 100/8 = 12.5 minutes.

 

[bathjobby]

Thanks ChrisR, thats useful too. Would expect a little longer than the 12.5 minutes as the boiler will also have been on during this period, but useful ground facts.

 

[ChrisR]

To rely on that you'd have to use W plan otherwise the heating might be on, circulating a whole systemful of cold water through the primaries. Also depends on the quality of the cyl and size of boiler, position and hysteresis of thermostat, etc

NB 12l/min isn't a lot. 30 l/min is quite nice, for 3 minutes or so.