IMM. I didn't say your solution was wrong, and I have indded heard of HepVo and equivalents. I investigated them for my own house.
I am not at all sure that the lack of a basin is a problem when selling a house. Its a building regs issue, and would need to be sorted if any 'material alerations' were made to that area, but there are millions of houses that don't match regs being bought and sold all the time.
Your points about how the suction works are valid IMHO.
I relative of mine had to put one in to sell as the surveyor noticed one was missing and the purchaser would not buy unless all points noted were rectified. It is a hygiene point, and I'm not sure if this can be forced to be updated (which it should be) in the event of a sale. For a long time now wash basins have to be in toilets.
That is how it is done in modern houses not my opinion on how it is done. Having a HepVo on the downstairs basin in any house would make matters better too.
HepVo is one the biggest unknown recent innovations around (1997 when it won an award). A whole piece of obtrusive roof penetrating stack (which can extract heat from the house) can be eliminated in 4/5 of homes (every 4th house requires an open stack vent and end of cul-de-sacs) and no large clunky air admittance valve near the toilet. HepVo makes waste piping a total doddle. And no water in the HepVo waste trap to run dry and smell if the house is empty for a while. Now if Hepworth can make a dry toilet bowl....
That occurred to me too, but I assumed Op would have noticed smelly water on his floor? But maybe its leaking unseen underneath the pan and seeping through floorboards? Yuck! I have seen this in an old house .....
I like Hep Valve too but a relative would not have one where it would have solved a problem because, "what happens when she drops her earring down the basin again? We normally just retrieve it from the bottle trap...." I gave up and told him to run a separate pipe to the stack
You still need a stack vent somewhere.
read yer regs.
They just undo and are easily removed.
Every 4th or 5 th house has a full stack vent, depending on where you live.
Ye Gods man! Learn to snip!
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