plumbing the depth

i’m working from home today as i’ve still got my millions of deadlines and times running out. so i did another 4am start.
but to make things more exciting today we’re also having our heating replaced and new radiator installed and stuff.
i’ve got 4 hours of work behind me already and i’m going to lock myself way so things should be fine. but it’s just what you need isn’t it.
here’s our current hot water tank. no idea if it’s going to be replaced or not. i don’t know how this stuff works !