You can always moor along the canal and walk to a pub, which are identified on your canal charts. In cabins on the boat, maybe even on the dining table. On some boats, the table converts into a platform for a bed. The person or persons using this bed should be early risers. Turn up the heat.
Rental boats have an efficient hot-water radiator system fired by a propane gas boiler.
Private boats are sometimes equipped with stoves burning coal or wood. You'll see sacks of coal or split wood on the roof of the boat. The toilet overflows. This is probably the most critical situation that will develop on your boat. It can be a real party pooper.