We have one jetted tub in a 5-room inn. It is an air jet (Bain Ultra, Québec) so it is easy to clean and there are no sanitizing issues as bath water never enters the pump system; it is installed over heavy fiberglass insulation with a wet sack of mortar mix laid down on the subfloor for support so it is quiet. Has underwater lights. Costs a quarter-gallon of LPG to heat it (same as an hour in the gas fireplace, so I guess amenities aren't free).
Every room has a nice, high-flow shower. Those are crucial, IMHO. Personally I dislike the sit-in-tub-to-shower arrangement. We have several large 2-person showers which are popular, and all showers have at least one hand-held with a long hose to help with cleaning.
I now mildly wish we had installed another jetted tub - I think it would have added to sales, maybe enough to pay the cost. I doubt a third jetted would have paid off and they use up a lot of space. Oddly, I find that about half of the guests booking the room specifically because of the jetted tub never actually use it. Then there are the guests who will spend 4-hours in it..
As per Tom, ours are all air jetted, all 4 of them and they are clawfoot air jet tubs for two. I would not be without them. Believe me, they attract guests all winter long.
We had one jacuzzi tub and got rid of it to replace with an air jetted one.
So 4 out of 6 rooms now have these air jetted double clawfoot tubs and they are the rooms which go first. The rooms also have a separate shower so we are covering everyone.
The nice thing is they are stand alone tubs so if someone were to buy this as a house and did not want the tubs, they could basically just unplug and unwire them and take them away.
Couples love them (especially in our cold winters) and I am so glad my DH convinced me we needed them.
Just don't ask me how much our water bill is.
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