water heater for floor heat

Reply

  #1  
Old 10-30-07, 08:32 AM
K
Member
Thread Starter
Join Date: Oct 2007
Posts: 2
Received 0 Votes on 0 Posts
water heater for floor heat

i built a 36x30 shop.i installed 1200ft of floor tubing.i have 50 gallon water heater.i would like to use 1 water heater for heat and domestic water.i need a diagrahm on how to hook up an open system.
 
Sponsored Links
  #2  
Old 10-30-07, 08:51 AM
Who's Avatar
Who
Who is offline
Member
Join Date: Jan 2006
Location: San Jose
Posts: 2,175
Received 0 Votes on 0 Posts
Does the installed tubing have an oxygen (EVOH) barrier? How long are each of your your heating loops?
 
  #3  
Old 10-30-07, 08:54 AM
K
Member
Thread Starter
Join Date: Oct 2007
Posts: 2
Received 0 Votes on 0 Posts
Originally Posted by Who View Post
Does the installed tubing have an oxygen (EVOH) barrier? How long are each of your your heating loops?
i have 3 loops 400ft long.
 
  #4  
Old 10-30-07, 09:39 AM
Who's Avatar
Who
Who is offline
Member
Join Date: Jan 2006
Location: San Jose
Posts: 2,175
Received 0 Votes on 0 Posts
You didn't answer the barrier Q.

For an open loop system (which I would never use or recommend due to legionella risk and specialty pump pricing - an iron pump wouldn't last long with oxygen in the water) you could tee/tap off the top and bottom of the water heater.

The top would be the supply and that would lead to a mixing valve where it would join on the hot side. The cold side would be a teed connection from the return manifold. The mixed side (this mixing valve lets you adjust your slab's water temperature in a simple manner). The pump would be downstream of the mixed side of the mixing valve leading to the manifold.

You'll need a pretty good size bronze or SS circ to pump water through 400' loops. Hope the diameter isn't 1/2" or smaller...

You could use a t-stat and relay to control the pump.

I would use a small boiler or a dedicated water heater and set it up as a closed system, but if your tubing doesn't have a barrier that's not really much of an option now.
 
  #5  
Old 10-30-07, 06:15 PM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 14,251
Received 23 Votes on 21 Posts
Water Heater

Most water heaters are not approved for use as a space heating appliance.
 
  #6  
Old 11-10-07, 05:09 PM
S
Member
Join Date: Nov 2007
Posts: 1
Received 0 Votes on 0 Posts
hot water heater for radient heat concrete floor

i hava a rheemglas fury. i am using it for my radient heat.

what is the most eficient to set the hot water temperature.
i have a mixing valve and 4 lines going out and 4 lines returning each 100' long.
right now i have the water heater set at 90 on bottom and on the top and the mixing valve at 90. it seems to use a lot of electricity that . my thremastat is set for 65.

is there a better setting on the water heater to use or a better way to set up the water heater.

i live out in the country and there is no HRH dealer around this area.
any help you could give me would be greatly appreciated

thanks for your time and energy

TIM
 
  #7  
Old 11-10-07, 05:55 PM
Join Date: Aug 2006
Location: usa
Posts: 902
Received 0 Votes on 0 Posts
Originally Posted by Grady View Post
Most water heaters are not approved for use as a space heating appliance.

And combined heating/potable systems run the risk of Legionella contamination.

Pete
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: