Question:
Does anyone know if the major hot tub manufacturers make hot tubs heated
> with natural gas? I know you'd still need electric for filtering and
> pumps but I would like to heat it with gas. I've seen aftermarket heaters
> but why add almost $1000 to the price if you don't have too.
Answer:
If you had to shove a (low BTU) tankless WH in one I would expect at least
$1K upcharge. Inline electric heaters are small and fit inside the tub
shape easily, gas would be much bulkier no matter what.
If you insist, you might try plumbing a small gas tank WH in the crawlspace
or nearby and rig up some sort of recirculation system with it in the loop.
This would require a bit of creativity and rework. Definately not standard
and causes you to put gray water through the WH tank which might have its
own problems. It also adds >25Gal to the tub capacity requiring more
chemicals etc.
