Unhelpful staff
We purchased a Diablo Hot tub last September. The tub came without a manual, but the staff assisted us in setting it up. We noticed it used far more electricity than our previous tub. The staff at WellNest prop[osed leaving the tub on longer - which would simply have increased the electricity use. When we rtemoved ther side we found that there was about 12mm of foam insulation on the tub surface, then an enormous airgap and a 3mm piece of foam inside the outside panel. This is effectively no insualtion at all. We filled plastic bags with loft insultation and stuffed these into the ujseless air-space. The electricity use more than halved. The staff at WellNest have not responded to any questions or queries since this started to go wrong - this includes not helping with replacement filters.