Location of your Tank

[Enigma]

The 40B we're working on is going in our bedroom on the top floor of our 1960s bungalow. It will run perpendicular to the outside wall, along the wall that seperates two bedrooms. The total system will be around 55 gallons.

I'm a little concerned, but Hubby (who is a flooring contractor) scoffs at my worry. We've got the old 1.5" site finished oak floors over shiplap. The shiplap runs at 45 across the beams. There is a 16" spacing on the 2"x7" beams.

Should I worry? How much weight should the floor be able to hold?

(Shhh! Don't let him in on my little lack of faith in his assessment!)

Edit: The bedroom is where I wanted it, as it is the only room of the house I really see during the work week other than the bathroom.

Edit2: There is a wall close to being beneath the tank in the basement, but it isn't load bearing (there are no load bearing walls in the basement, other than the foundation).