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## Main Question or Discussion Point

Hi Guys,

I am aware how to calculate flow rate Q (c x dt), but when sizing a direct gas fired water heater there is no dt but of course need allow for temp rise, but what parts of information can be known and unknown and how would i even start to put a formula together? Ultimately i would like to be able to size the flow rate required?

Any help would be really appreciated!

Regards

Lewis

I am aware how to calculate flow rate Q (c x dt), but when sizing a direct gas fired water heater there is no dt but of course need allow for temp rise, but what parts of information can be known and unknown and how would i even start to put a formula together? Ultimately i would like to be able to size the flow rate required?

Any help would be really appreciated!

Regards

Lewis