[Greenbuilding] Max Temp Storage Water Heaters+TemperatureSensors

[elitalking]

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 
  ----- Original Message ----- 
  From: natural building 
  To: Green Building 
  Sent: Wednesday, February 02, 2011 11:04 AM
  Subject: Re: [Greenbuilding] Max Temp Storage Water Heaters+TemperatureSensors


  Eli, this begs the question: if you are already replacing the water heater, why not get an on-demand electric tankless system that supplies water to the bathroom only when you want it?  More compact than any tank so you can put it somewhere convenient and it would eliminate virtually all the unavoidable standby losses associated with a tank?


  Regards,

  Steve Satow


  www.naturalbuildingsite.net
  naturalbuilding at shaw.ca


  On 2-Feb-11, at 7:41 AM, elitalking wrote:


    I am replacing a water heater that is in a location that is inaccessible for servicing.  We have been in the practice of turning the heater on when we are getting ready for a bath to avoid the standby heat losses
    (Energy $$) from continually heating the water. 

    I want to know the maximum temp that typical storage electric water heater can safely accommodate.  Since we are not storing the heat, the higher temperature is not an energy penalty.  The higher temp allows for a smaller tank.  We are separating the kitchen use from the bathroom.  Tank will located next to the bathtub.  We will have an on off switch at the tank. 

    Does anybody know of a heat sensor and or sound indicator when the water reaches a set temperature? Currently we allow more time than is necessary because we want to avoid being too cool.  It sure would be nice to know what is going on. 

    We could use a 20 gal tank for 20 gal bath and set at temp for bath.  However, we use a cistern.  During dry spells (most of the time) we mix creek water in bath to reduce water usage off of cistern.  Results of my spread sheet below show that 20gal bath can be supplied with 10gal HW tank at 185F.  Can a normal temperature relief valve store that kind of pressure-temperature?




------------------------------------------------------------------------------


  _______________________________________________
  Greenbuilding mailing list
  to Send a Message to the list, use the email address
  Greenbuilding at bioenergylists.org

  to UNSUBSCRIBE or Change your List Settings use the web page
  http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/greenbuilding_lists.bioenergylists.org/attachments/20110202/3ce458d5/attachment.html>