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Kiwitub Burner

The Kiwitub burner took five years to develop. We went through seven prototypes and over a hundred time trials to arrive at the final production design. We're scared to change it any more as we think we've got it right. We think it'll last for 200 years - this isn't hype.

It's made in Dunedin by experienced boilermakers out of copper with a cast brass door, feet and fittings. We use copper because it'll transfer heat through itself a staggering 25 times better than stainless steel. There are no motors or pumps to make noise or wear out - water heated in the burner circulates into the tub purely by convection, just like a wet-back loop on a domestic hot water cylinder. It's rated at 36kW output - which is huge. A big electric heater in your house would be about 3kW, and most spa pools are 1kW. This is how we can heat the tub water as fast as we do.

The burner runs on various fuels. If you want to run it on gas, just connect the stainless steel gas tube burner to a 9kg LPG barbecue-type gas bottle, slide it inside the central chamber, and light the gas. If you want to run it on firewood, just slide in the stainless steel grate instead, and build a wood fire on that.

The PVC, neoprene and closed-cell foam insulation jacket comes as standard with the burner. It cuts the heat loss from the top of the burner in cold, wet, windy or snowy conditions.


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