Can a toilet be mounted without bolts (on silicone alone)?

No. Silicone will hold it in place for the first few months, but every time someone gets off the seat the toilet shifts, the silicone tears, and you end up in a puddle. Bolts into the floor are mandatory.

Is a gasket (rubber or felt) needed under the toilet?

It depends on how level the floor is. If the tile is perfect — no. If there are 2–5 mm irregularities — a pad and/or silicone seal compensates and prevents rocking. Heavy one-piece units can crack even porcelain stoneware without a pad.

How soon can I use it after installation?

Right after the plumber does the test flush. The only limitation is that the silicone around the base should not be wetted for 24 hours, but you can use the toilet itself — the outside silicone stays dry.

What happens to the old toilet?

The plumber usually hauls it away for ILS 50–150 or free (if bundled with new install). In Israel, municipal bulky-waste pickup by phone works in most cities. The toilet is broken up with a sledgehammer before disposal — porcelain is not accepted whole.

Toilet installation in Israel — floor-standing and wall-hung, prices, timing

KABLAY

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Toilet installation in Israel — floor-standing and wall-hung, prices, timing | KABLAY