Recent content by qwertyjjj

And here's the temperature controller mounted on the side.

Not sure why it is around here but the cheapest used spa is not cheap. Plus I really wanted a wooden hot tub and there's no used ones. I could of course clad a used one in wood if I could find one. Here's the only pic I have attached. Even if I fixed up a used spa I'd likely have to buy a spa...

Hot tub

I've found a used jetpack 941100 pack but it doesn't have a topside controller. Is it possible to make the pump work without the topside? I'm assuming it has its own on off switch. It does have a separate Johnson a419 controller mounted on the side of the pak but it's a separate controller...

I know you're supposed to use clear cedar but they are hard to find. If you use knotty cedar, what are the chances that one of the knots blows out? I assume if it did you can just plug it with another piece of wood that swells? Or put some water seal on them?

Is it possible to build a wood hot tub out of pine or spruce? I've only ever seen cedar used but it's difficult to find around here for a decent price

So, it would take about 3 days to heat up. After that I assume they maintain temperature with a cover fairly easily? Is there a calculation for heat loss or estimate say on the really cold days? I assume your heart calculation above is at reasonable temperatures?

The ones I've seen are 4.5kW heaters, only need one 240v circuit and a very 120 for the pump. I'll check with your calculation, thanks.

No, they're the air difference ones, they are a stand alone unit. They don't work much below -20 Celsius but until that point they're still pumping out heat. No coil in the ground.

I'm not sure about heat pumps, I assumed it was resistive. We do use heat pumps here for heat in houses that work below -20 Celsius but not sure if the same could be used for hot tubs.

I'm thinking 1,000 gal, maybe 2,000 (2' x 8') Electric heat. Will be covered whilst kept hot. Maybe kept hot for a week then off until next use maybe a free weeks later (would need a heater to prevent complete freezing).

I am thinking of making an 8 person diy hot tub for use in the winter. However, at our location it can sometimes get to -20 Celsius at night, -10 during the day. What size heater would I need to maintain a good hot tub temperature in those conditions?

FC 7.8 TC 9 Cyk 42 I have shocked multiple times now increasing to 16fc each time. No matter what I do, I cannot get the difference between FC and TC to be less than 0.5 The water has been crystal clear for days now. Any ideas what to do?