"Mark Hewitt" wrote in message
...
Having installed a combi boiler recently we no longer have the backup of
the
immersion heater in the cylinder. So we are thinking about installing an
electric shower so that at least that will continue to work should the
boiler not be working for any reason.

However since we are having to modify the bathroom to take the new shower
I
would like to make regular use of it, not just in emergencies, it would
probably be best in that case for the shower to be able to run off the hot
water supplied by the boiler.. but should hot water not be available it
should be able to generate its own.

Is there such as thing as an electric shower which can use a hot water
input
when it's available?

It is best to install a normal pressure balanced mixer for the shower fed
from the combi. In the hot water line have an in-line instant electric
water heater for backup. The hot water from the combi just runs through the
heater. It will give a dribble of a shower in comparison, but get you wet
and clean when the combi is down, which should not be very long.

You can pick up the in-line heater for around £80-100.