Manual American Water Heater ATO-705A-N

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  • American Water Heater ATO-705A-N - page 1

    Tankless W ater Heater System Design Manual Plumbing schematics for single and multiple tankless water heaters in use with domestic systems, recirculation, and storage tanks. PRINTED 0708 186965-000 ...

  • American Water Heater ATO-705A-N - page 2

    2 Certifications .................................................................................. 3 Water Quality and Scale ................................................................ 4 Pump Sizing for Circulation .......................................................... 5 T able of Contents Tank Water Heaters in a Circulation Loop Addition ...

  • American Water Heater ATO-705A-N - page 3

    3 Approvals Certified to applicable U.S. standards for appliances using gas or other petroleum fuel. Certified to applicable Canadian standards for appliances using gas or other petroleum fuel. Certified by the Uniform Plumbing Code (UPC) Certified by National Sanitation Foundation (NSF), www.nsf.org (indoor models must use the NSF approved top gua ...

  • American Water Heater ATO-705A-N - page 4

    4 W ater Quality and Scale A complete water analysis and an unde rstanding of system requirements are needed to prote ct the tankless water heaters and water heating systems from scale. Water analysis shows whether water is hard or soft. Hard water, unless treated, will cause scaling or liming of the heat exchanger. The rate of scaling increases wi ...

  • American Water Heater ATO-705A-N - page 5

    5 Pump Sizing for Circulation 1. Use the chart below or one appropriate for your co nditions to determine the heat loss in the length of the hot water supply and return piping. For example, 100 ft of 1-1/2 in bare copper tubing results in a heat loss of 5300 Btu/h. 2. Determine the acceptable temperature drop at the last fixture in the loop. For ex ...

  • American Water Heater ATO-705A-N - page 6

    6 T ank W ater Heaters in a Circulation Loop The following applies when using a tank water heater (gas or electric) to provide heat for a circulation loop. Drawing WH-1-RGE is an example. The heat output of the tank must be equal to or greater than the calculated circulation loop heat loss. (Reference page 6, Step 1 on calculating heat loss). Elect ...

  • American Water Heater ATO-705A-N - page 7

    The following applies when using tankless water heaters to recover a storage tank. Drawing WH-1-B is an example. Tankless water heaters have a pressure loss which must be considered in the system design. Reference the pressure loss curve for the heater m odel being used to determine the pump size for the desired recovery rate. For recommended pump ...

  • American Water Heater ATO-705A-N - page 8

    8 Pressure Loss Curves Pressure Loss (psi) Water Flow (gpm) 0. 0 5. 0 10. 0 15. 0 20. 0 25. 0 30. 0 35. 0 40. 0 45. 0 01 234 56 789 1 0 1 1 0. 0 10. 0 20. 0 30. 0 40. 0 50. 0 60. 0 Pressure Loss (ft head) 705 305 i 505 305 e ...

  • American Water Heater ATO-705A-N - page 9

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1 Domestic Hot W ater - S tandard Installation 1 Tankless Water Heater Preferred Piping Installation G a s S u p p ly 3 / 4 " C o l d W a t e r ...

  • American Water Heater ATO-705A-N - page 10

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2 Domestic Hot W ater - S tandard Installation 2 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineering ...

  • American Water Heater ATO-705A-N - page 11

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-3 Domestic Hot W ater - S tandard Installation 3 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineeri ...

  • American Water Heater ATO-705A-N - page 12

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-4 Domestic Hot W ater - S tandard Installation 4 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineering ...

  • American Water Heater ATO-705A-N - page 13

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-5 Domestic Hot W ater - S tandard Installation 5 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineeri ...

  • American Water Heater ATO-705A-N - page 14

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6 Domestic Hot W ater - S tandard Installation 6 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineeri ...

  • American Water Heater ATO-705A-N - page 15

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-D Domestic Hot W ater - O p t i o n a l F r eeze Protection 1 Outdoor Tankless W ater Heater Preferred Piping Installation June 11, 2007 This is n ...

  • American Water Heater ATO-705A-N - page 16

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-D Domestic Hot W ater - O p t i o n a l F r eeze Protection 2 Outdoor Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This ...

  • American Water Heater ATO-705A-N - page 17

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-3-D Domestic Hot W ater - O p t i o n a l F r eeze Protection 3 Outdoor Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This ...

  • American Water Heater ATO-705A-N - page 18

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6-D Domestic Hot W ater - O p t i o n a l F r eeze Protection 6 Outdoor Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This ...

  • American Water Heater ATO-705A-N - page 19

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-RGE Domestic Hot W ater - C i r c u l a t i o n S y s t e m s 1 Tankless W ater Heater with Gas or Electric Tank Preferred Piping Installation Feb ...

  • American Water Heater ATO-705A-N - page 20

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-R Domestic Hot W ater - C irculation Systems 1 Tankless W ater Heater Optional Piping Installation June 11, 2007 This is not an engineering dra ...

  • American Water Heater ATO-705A-N - page 21

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-RGE Domestic Hot W ater - C i r c u l a t i o n S y s t e m s 2 Tankless W ater Heaters with Gas or Electric Tank Preferred Piping Installation Fe ...

  • American Water Heater ATO-705A-N - page 22

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-R Domestic Hot W ater - Circulation Systems 2 Tankless W ater Heaters Optional Piping Installation February 27, 2008 This is not an engineering dr ...

  • American Water Heater ATO-705A-N - page 23

    23 Domestic Hot Water - Circulation Systems 3 Tankless Water Heaters with Gas or Electric Tank Preferred Piping Installation Tankless Water Heater Tankless Water Heater Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boi ...

  • American Water Heater ATO-705A-N - page 24

    24 Tankless Tankless Tankless Tankless Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6-RGE Domestic Hot W ater - C i r c u l a t i o n S y s t e m s 6 Tankless W ater Heaters with Gas or Elec ...

  • American Water Heater ATO-705A-N - page 25

    25 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-B Domestic Hot W ater - Backup Storage 1 Tankless W ater Heater Preferred Piping Installation February 27, 2008 This is not an engineering draw ...

  • American Water Heater ATO-705A-N - page 26

    26 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-B-R Domestic Hot W ater - Backup Storage / Circulation 1 Tankless W ater Heater Preferred Piping Installation February 27, 2008 This is not an ...

  • American Water Heater ATO-705A-N - page 27

    27 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-B Domestic Hot W ater - Backup Storage 2 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineering dra ...

  • American Water Heater ATO-705A-N - page 28

    28 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-B-R Domestic Hot W ater - Backup Storage / Circulation 2 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not ...

  • American Water Heater ATO-705A-N - page 29

    29 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-3-B Domestic Hot W ater - B a c k u p S t o r a g e 3 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an e ...

  • American Water Heater ATO-705A-N - page 30

    30 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-3-B-R Domestic Hot W ater - Backup Storage / Circulation 3 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an ...

  • American Water Heater ATO-705A-N - page 31

    31 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6-B Domestic Hot W ater - Backup Storage 6 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineering dra ...

  • American Water Heater ATO-705A-N - page 32

    32 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6-B-R Domestic Hot W ater - Backup Storage / Circulation 6 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an ...

  • American Water Heater ATO-705A-N - page 33

    Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e M-1-F 1 Tankless W ater Heater Maintenance - Scale Flush Procedure June 11, 2007 This is not an engineering drawing; it is intended only as a guide and ...

  • American Water Heater ATO-705A-N - page 34

    34 Notes ...

  • American Water Heater ATO-705A-N - page 35

    35 Notes ...

  • American Water Heater ATO-705A-N - page 36

    • 500 T ennessee Waltz Parkway • Ashland, TN 37015 • ...

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