Electric to heat bath water only

[NorthumberlandMark]

Converting my old home office (not attached to the house) to an occasional ensuite bedroom.
Fitting a decent sized roll top bath and looking for a way to heat the bath water. Electricity is the only option. Won't be fitting a shower and heating already covered by WiFi heaters.
Have a plentiful cold water supply and drainage/ toilet already in place too.
Any ideas on how to supply plenty hot water to a relatively large bath much appreciated.

 

[noseall]

Converting my old home office (not attached to the house) to an occasional ensuite bedroom.
Fitting a decent sized roll top bath and looking for a way to heat the bath water. Electricity is the only option. Won't be fitting a shower and heating already covered by WiFi heaters.
Have a plentiful cold water supply and drainage/ toilet already in place too.
Any ideas on how to supply plenty hot water to a relatively large bath much appreciated.

An electric shower would probably be the most sensible. Most folk will be scratching their head, your installing a very ostentatious bath, in an occasional use ensuite.

Baffled?

 

[JohnD]

Fitting a decent sized roll top bath and looking for a way to heat the bath water. Electricity is the only option.
Any ideas on how to supply plenty hot water to a relatively large bath much appreciated.

Hot water cylinder. Large and well insulated. A 16A circuit will be sufficient for the immersion heater. It will take about 1 minute per litre of water heated. Good insulation will keep it hot for days. You say you cannot fit a Woodburner or multifuel stove.

In some cases you can add solar panels to tne roof of your outbuilding.

You may need a cold-water tank to fill the bath at a good rate.