Electric Showers

Hi Cathal, 

I've never come across an electric shower on my projects, so this is interesting. I know when variable settings have come up for other credits, we've been required to use the worst case--in this case the highest flow--for the calcs, since there's no guarantee users wouldn't run things to the max on their own. This case may be a little different, since I doubt most users will want scalding showers all the time. It also appears there are showers that have temperature stabilizing technology, which helps surges/drops during showers from increased demand. I also see some eco- versions that are reduced flow.

It'd probably be best to contact GBCI and ask them directly and cite the model(s) you're planning to use, since they seem to vary greatly depending on both kW rating, power supply, and water supply. 

Please post back responses/results if you're able, in case this comes up for other projects.