Hot&Cold Storage tank overflow reroute to sink waste

[Haltamer]

Related to the floor replacement becoming full-bathroom joist-up refurbishment ( https://www.pistonheads.com/gassing/topic.asp?h=0&... )

I've a quick question regarding overflow plumbing for the hot & cold water storage tank.

They use a combined 22mm PVC Waste which, at the moment, in true bodge spirit, is through a rough hole in the wall - exiting above the sink with not quite enough pipe for it to actually fall into the sink if it ever does run....

In other words, at present, the overflow is visibly running into the sink.

To tidy things up, I was wondering if it would be possible to integrate this directly into the sink waste plumbing - Perhaps some kind of adapter would facilitate, above the U-Bend to keep the swamp gas out of the storage tanks?

The reason I ask is I can't find much on this in building regs / plumbing advice - All seem to have the storage overflow running directly out of the house and into a back garden - In the spirit of "Thinking before I act" - I wonder if this may be due to issues with "Clean" storage touching the sewer, or "You should be able to see it overflowing to fix it" (Thanks to the tank location, I can hear it anyway)

If need be, I could run it all the way around the room and out through the brickwork.. but I'd really rather not. (Would need to go to the far corner of the room as I don't fancy drilling the concrete crumblecake with external hanging tiles!)

TL; DR:
Can I put the storage tank overflow into the sink waste above the U bend?

[GasEngineer]

The pipe is also known as a warning pipe.

If the tank is overflowing then it is quite obvious as you have the water visibly dripping or running from the pipe.

If you are plumbing it in you need a visible tundish so that you can see the drips (as well as the u bend you mention).

[clockworks]

If the tanks ever overflow, you'll want some visual indication that something's gone wrong -
a pipe through the wall, or a tundish.

[Haltamer]

Perfect, Thanks chaps!

At the moment the hot & cold are combined, so it's a good opportunity - If I pop in a tundish on both of the tanks output lines before they merge It'll make it easier to localise the problem at the same time.