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Kiwitub in the mountains
Why the Kiwitub is NOT a spa pool.

It's like this. Spa pools were invented in America in the 1950s. A plug-in spa pool usually has about a 1 kW/hr electrical heater. (By comparison, a big plug-in electrical heater in your home would be about 3 kW/hr.) So they take 10-20 hours to heat the water up from cold. So to have them hot when you want them, you leave them on the whole time. This means continuous electricity use, whether you're in them or not, or you're away, or the novelty's worn off. It's like a mortgage.

Also, because the same water stays in a spa pool for months, they need chemicals every couple of days to suppress the bugs. It also means new filters from time to time, plus soaking in water lots of other people have been in.

The Kiwitub burner is 32 kW/hr. This is a huge amount more heat output. This means we can heat the tub from cold so fast that it's pretty much like having it on call anyway, but there are NO ongoing costs until it's wanted. The tub just stays empty and turned off until you decide it's time for a soak. This makes the tub ideal for baches, B&Bs, farmstays, huts, etc. Just fill with clean fresh water or seawater no-one else has been in and heat. 

Even on gas, it's cheaper at home to use it only every couple of weekends or so than a spa pool left on all the time. It depends how cold the water is to start with, but say between about 45 minutes to heat up to bath temperature on LPG gas on Waiheke Island, or one hour 25 minutes in mid-winter Dunedin with ice on the ground. irewood takes about 50% longer, but of course if you're running it on free firewood or driftwood then it's free.

Plus we don't need chemicals because the water stays in for only a few days, you can take the Kiwitub places and have adventures, and you can make coffee on it.

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