[Greenbuilding] Max Temp Storage Water Heaters+TemperatureSensors

[natural building]

Personally, I would recommend the Hubbell heaters ( http://www.buytankless.com 
  ) but they may be more than you need in your situation. I have been  
using the biggest (28 kW whole-house) unit for a couple of years now.  
It is extremely well designed and, for the most part, operates very  
well. It can easily handle 120F or more and can be set to whatever  
outlet temp you want (within reason).

The reason I suggest that it might be more than you need is because it  
has the most accurate and sensitive flow meter of all the different  
manufacturers ( 0.25 pgm where most others are either .5 or higher).  
This may not be of any use in a bathroom application. It also is one  
of the few units that can accept modulated input water temperature, so  
you can use it in a re-circ system and it will adjust its output to  
suit the input. If your input temp is always the same, then this might  
be redundant.

It also has some other very intelligent design features that, IMO,  
make it stand out from the crowd. Things like 16" mounting hole  
spacing (you'd be amazed at how few of the others have thought of  
this) and 'Sharkbite' connectors for the inlet and output pipes, which  
make it very easy to install and maintain.

The downside with tankless systems is that they cannot 'buffer' the  
water temperature, so if the demand changes, the temperature changes,  
albeit briefly as the system adjusts. But, for a single bathroom this  
may not be a problem.

Regards.
Steve Satow

www.naturalbuildingsite.net
naturalbuilding at shaw.ca

On 2-Feb-11, at 9:59 AM, elitalking wrote:

> Can you recommend a brand of electric tankless heater.  I am looking  
> to be able to get 120F.  I could probably make due with less.  This  
> would not allow me to mix cold creek water during draught  
> conditions.  Therefore, I would need to use only cistern water.  The  
> ambient water temp is 55F.  To get to 120, I need a rise of 65F.  I  
> suppose I could slow the flow rate to get a higher temperature.  The  
> normal flow rate is likely around 3 gpm.
>
> Thanks for your input.
>
> Eli

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