No, "new geezer" is not an oxymoron. A geezer is what a hot water heater is called. And I got a new one.
When we moved into the flat, there was not a geezer in the kitchen, meaning there was no hot water at the sink there. I mentioned this to the landlord, thinking it would be impossible that anything would happen anytime soon. But he said, "A geezer? Why not?" And the next day he went out and got one.
I was amazed. Things never happen that quickly here. Especially when it involves spending money for someone else's benefit.
And look: it's even a special windsurfer one. So nice, huh?