@Alice1644 I agree with @Andrea6232. I think a wood fired Hot tub although a nice idea would be too much work for your guests.
They take a long time to heat up so if you guests are staying just for a night or 2, they either wouldn't be able to use it or are waiting half of their stay for it to heat up, or you would have to be on the ball and have it heated for them.
We have electric hot tubs at our listings and yes, you do need to use chemicals and they do need to be checked and tested every day, even when guests are staying. I use to do it every other day, but I have found although I let guests know what to do and what not to do with the Hot Tubs, some don't seem to listen. I have twice found the hot tub 1/2 empty because they left the fountains on and put the lid down so when the tubs self cleaned, the water hit the lid and came out of the sides. So that meant they couldn't use the hot tub for the rest of their stay. Also I have had a guest who thought it would be a good idea to put more water in and that damaged the tub. And I also should mention, fake tan and guests who think it is a good idea to go in with shampoo or conditioner in their hair.
Hot Tubs take a lot of work and are expensive to maintain, and they need to regularly cleaned, emptied, refilled, filters changed or cleaned etc. etc. It is easier if you are an onsite host.
Saying that I have found that they are a big enticement for guests to book and also used to be quite profitable, now with the raise in electricity prices etc, that side of things isn't so good.
Hope this helps
