I've never known anyone who has had one. I've heard that they are expensive to heat up.

@caletafuerteventura 

Nor me Stephen, I have enjoyed using them on the rare occasion with a chilled glass of Rioja and I understand their popularity but I will leave the details of its cost and maintenance for them to sort out ? 

My neighbour has an hot tub (already installed when he bought the house). He used it during 2-3 months.  And now it's just one of the garden decorations.  A daily use needs a daily heat. 

I recommend PoolMark in El Matorral. Always had excellent service from them.

Thanks Tricky I’ve passed on your recommendation