Hot Water Plumbing Problems

[mariyasmth11]

Hey there.
So we have an old home (1902) that is 3 stories.
We currently have a tenant in our ground floor apartment. She just informed me that she is unable to get the hot water to come out of the bathroom sink tap.
She could let it run and run and it will not get hot at the sink tap.
Her kitchen sink tap works fine.
Our kitchen sink tap works fine.
Our 3rd floor bathroom sink gets hot pretty quickly but
our 2nd floor bathroom sink tap has the same problem that out tenant does...
Our 2nd floor bathroom sink hot water has NEVER gotten hot (unless I take a shower in there beforehand) and we've just learned to live with it, since our primary bathroom is on the 3rd floor...
Anyway, this is a new problem ( we think) for our ground floor bathroom sink as our previous two tenants never mentioned it.

We have a tank (blech) water heater 80 gal on the ground level of the house, so her bathroom is actually the closest to the source of hot water.

We can't figure this out.

Any ideas oh plumbing gifted folks out there? Thanks!

[tooltroll]

Really tough to say without some idea of how your plumbing all fits together. So, a few guesses:

How old is the plumbing? If it's decades-old galvanised steel, there may be rust restricting flow through a cool area, allowing the water to cool. Might be time to bite the bullet and replace your plumbing with copper or pex.

So silly it might be true: Are the taps in those bathrooms backwards, or both cold for some reason? If there's been a bunch of different plumbers in there over the years, things can get really screwy (That's a technical definition, btw :D) Maybe the previous tenants just lived with it. . .