Toilets in historic houses turn into floor problems faster than they do anywhere else, because of what is under them.
Corroded flanges and old floors
Cast iron closet flanges corrode, the toilet begins to rock, and the wax seal fails. Water then goes into a heart pine subfloor rather than the bowl. On original flooring, a wobble is not a minor annoyance — it is damage in progress.
Non-standard rough-ins
Older peninsula bathrooms often have rough-in dimensions that no longer match standard modern fixtures. That is solvable, but it is why a straightforward-looking replacement sometimes is not.
Short-term rental turnover
Guest properties see heavy use from people unfamiliar with the plumbing. Replacing an ageing toilet between bookings is far cheaper than an emergency call with guests in residence and a review at stake.
Running quietly
A continuously running toilet is the most common and least noticed problem we find, and it adds steadily to a water bill nobody has questioned.