"What was the morning water temperature after being off overnight?"What was the morning water temperature after being off overnight?
I could only wish for $0.30/kwh. We are now at $0.50/kwh.
"But looking at yours, it seems to me that you could cut a set of sheet foam panels and press them into the frame (as in my case) and really maximize the insulation."
What was the lid temperature in this picture?
That sounds like a good function. Mine does not have a clock or time of day type thing. There are other functions but without a clock it's tough to make use of them.
Nope, not pushed against anything and I have access to all 4 sides. But, there is limited space to work with. The corners are the areas I need to stuff insulation to most but are hard to access.
I have confirmed the foam is missing from most of the shell. It was sprayed on the plumbing and what not but not on the shell.Based upon the latest surface temperatures, below is a very simple model to estimate heat loss based upon your measurements. The second column assumes that all of the shell has 2" of foam on the surface. The third column shows a scenario to get close to 24kwh per day of energy loss you had estimated. Either the foam is ineffective (e.g. too dense) and/or it doesn't cover much of the shell.
View attachment 625503
Hot Tub Heat Loss
docs.google.com
I spoke with the support group of the parent company and have a "ticket" in. But my concern is, the spray "full foam" and Extreme foam addition should all have been during the manufacturing process. So, how can they make good on it now that the hot tub is at my house and has a layer of foam covering access to the shell? I sent them a video of the missing foam insulation, but that's just the area(s) I know about and can see. There's probably lots of other surface area that is supposed to have foam insulation and doesn't and I don't even know about it because I can't see it.
This is a cool spreadsheet. Knowing now based on looking inside the hot tub cabinet more today that this hot tub left the factory floor without having been foam insulated properly, I wonder how the company will try to "do right by me" if at all? How can they add foam to the shell now that it's been fully built and assembled?Based upon the latest surface temperatures, below is a very simple model to estimate heat loss based upon your measurements. The second column assumes that all of the shell has 2" of foam on the surface. The third column shows a scenario to get close to 24kwh per day of energy loss you had estimated. Either the foam is ineffective (e.g. too dense) and/or it doesn't cover much of the shell.
View attachment 625503
Hot Tub Heat Loss
It won't be easy to add foam. Stuffing bubble wrap in the open areas would probably be a big improvement. Just stay away from the pump and heater. The objective is to remove as much of the air gaps as possible.
If you actually believe that the air is cooler near the spa bottom within the spa walls than near the top, that actually increases heat loss in that area since heat transfer is proportional to the temperature difference of the two boundaries of the media. So the bottom becomes even more important in that scenario.
I have stuffed insulation into as many open areas as I can access to. Most are through slits the width of my hand so it is quite difficult. I also added some double sided foil lined insulation wrap in front of the access panels on all sides.
No, it's on an ezpad, which is basically a composite material type thing made for putting hot tubs on.
