Yes, you can have a bath on a canal boat. Widebeam craft are unrestricted in terms of space and standard domestic baths can be happily installed.
Baths are a little trickier to accommodate in narrow beam craft. However there are suppliers and a trip to your local chandlery
will usually unearth several options for you to choose from. Look on-line for specialist suppliers as often good deals can be had on unusual styles. For narrow boats, plan on dimensions in the region of 120cm x 70cm square with an internal depth of 40cm or so & you can’t go wrong.
What you will have to carefully plan is water capacity, pump capacity and water heating to adequately take advantage of your luxury installation.
Using the average size above and filling it ¾ full would mean you will have to store and heat over 200 litres of water to enjoy the same sensation as at home. That’s at least 2 large calorifier
s full of water which will need replacing from the water point.
It’s doable, but as we say requires careful planning and probably the use of the immersion facility on the calorifier
as well as the engine heating.