[RE-wrenches] Chofu Hot Tub Heater

William Miller william at millersolar.com
Tue Mar 3 15:33:19 PST 2015


Ray:

Nothing is more civilized than heated flush water!

William



> On Mar 3, 2015, at 10:30 AM, Ray Walters <ray at solarray.com> wrote:
> 
> I think the jet tub is the better way to go for off grid.  You are only heating the water and running the circ pumps a few hours/ week, and as Bill mentioned: no chemicals.
> I've tried all of the choices, and while hot water alone is nice, having the massage bubblers is definitely better.  Not having chemicals and/ or nasty recirculated bacteria is also much better than regular hot tubs.  Off grid folks don't have to do with out modern conveniences, instead they can do it even better.
> If you wanted to get savvy, you could recycle the water after to a grey water cistern dedicated for toilet flushing and irrigation.
> R.Ray Walters
> CTO, Solarray, Inc
> Nabcep Certified PV Installer, 
> Licensed Master Electrician
> Solar Design Engineer
> 303 505-8760
> On 3/3/2015 7:30 AM, Bill Loesch wrote:
>> 
>> Hi Brian,
>> 
>> Great alternative and proven solution. Moreover, the sanitation aspect to heat the water once per use all but eliminates the prospect of breeding "bugs" in the stagnant warm water. It is my understanding that spas/hot tubs that continuously reheat the same water need to have chemicals added to keep them sanitary (at least that is the way it works here for a public spa/hot tub).
>> 
>> One other item, necessary to mention for all the rest of us not living in the relatively mild CA/coastal climate-since the tankless stores no heated water all tankless water heaters are subject to freezing conditions.  Oh, yes, one can take on Mother Nature and add electric heaters, anti-freezing firing, etc. but for real world practicality, don't subject water to freezing conditions. Solution: mount the tankless inside the heated structure and run the hot tub line through a freeze protected faucet. 
>> 
>> Thanks for sharing, Brian,
>> Bill Loesch
>> Solar 1 - Saint Louis Solar
>> 314 631 1094
>> On 02-Mar-15 1:15 PM, Brian Teitelbaum wrote:
>>> Hey Allan,
>>>  
>>> For many years, my wife and I have been using an old 6’ long claw-foot tub as our hot tub on the mountain. The 6’ tub is large enough, but very cozy for two people. We just run straight hot water from our Aquastar propane water heater into it, which gets it very hot. It takes a little time to               let it heat up the cast iron tub, which cools it down just enough for a great soak. It stays hot for a pretty long period of time, but If it gets too cool, we just run more hot water into it.
>>>  
>>> Then we just use the gray water for garden irrigation the next day. No chemicals, filters, or electricity needed.
>>>  
>>> Brian Teitelbaum
>>> AEE Solar
>>>  
>>> From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Allan Sindelar
>>> Sent: Sunday, March 01, 2015 6:05 PM
>>> To: RE-wrenches
>>> Subject: [RE-wrenches] Chofu Hot Tub Heater
>>>  
>>> Wrenches,
>>> I have an off grid client who wants a hot tub, and would prefer a propane heater rather than wood. The Chofu appears to be the only unit that doesn't require a circulation pump. He had located this on his own, but told me that "The propane fired, self igniting, hydrosiphoning Chofu is no longer available domestically. Seems the Japanese do not wish to export these to the USA anymore.  I will keep looking as this was the most sane idea for the project and of course cheapest. Chofu listed on Island Hot Tub is currently unavailable. I talked to him a week ago and it sounded like there was no availability for the foreseeable future."
>>> 
>>> Does anyone have a line on where one can be located before they're all gone? Or a good alternative?
>>> 
>>> Thanks, Allan
>>> -- 
>>> 
>>> Allan Sindelar
>>> allan at sindelarsolar.com
>>> NABCEP Certified PV Installation Professional
>>> NABCEP Certified Technical Sales Professional
>>> New Mexico EE98J Journeyman Electrician
>>> Founder (Retired), Positive Energy, Inc.
>>> 505 780-2738 cell
>>> 
>>>  
>>> 
>>> 
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