The standard floor mount Aquia has a little edge on noise levels. I think you would be safe going for the wall hung Aquia.
I've been considering installing one in my home just to try it out.
Remodelling a bathroom near a kitchen (public space) and would like the quietest unit possible.
Also going for a modern design, so a wall hung, tank in-wall unit would be an advantage - also easy to clean floor. Also using wall hung vanity for similar reasons.
The walls are 2x6 construction (even interior - the toilet is against a LB wall) so plenty of room for an in-wall tank.
So if I go conventional, I am thinking about the Ultramax. In-wall, the aquia.
Any thoughts on which would be quieter, better flushing, etc.? Other considerations?
I may be over thinking this, however, in the case of a standard floor mount toilet, I have a solid 2x6 wall with a layer of sheetrock on either side (and kitchen cabinets on the kitchen side) to attenuate noise.
However, for a wall mount with in-wall tank, there is only 1 layer of sheetrock between the in-wall tank and the kitchen (plus the cabinets), and the toilet is (acoustically) coupled to one side of the 2x6 wall and potentially able to better transmit vibration through it.
Any comments on the above (other than I'm nuts and over thinking the issue).
I'm thinking the tank fill is likely quick and very quiet in any circumstance.
It is the air gap (right term) at the end of the flush that is the big noise and I don't think this resonates the porcelain, let alone the metal frame and wall - Thus, I don't think it will make much difference.
I just don't like the bathroom near the kitchen in the first place (it is located closest to the eat-in area to make matters worse.), but have to deal.