Domestic Hot Water Recirculation get it hot fast

Domestic Hot Water Recirculation… …get it hot, fast and NOW!!

Let’s Look At Some Facts… • Water heating is 2 nd or 3 rd largest residential energy use • 14 -25% of the pie • Then there’s the waiting…

1970 to Today – Everything’s Bigger! • Median home 50% – 1970: 1600 SF – 2010: 2400 SF • Distance to furthest fixture 266% – 1970: ≈ 30 feet – 2010: ≈ 80 feet • Hot water fixtures 100% – 1970: ≈ 6 – 2010: ≈ 12

What Does That Mean? • More fixture units more volume • More volume bigger pipe • Bigger pipe + lower fixture flow rates reduced velocity • Reduced velocity + increased distance …. • ≈ 18 times longer to get hot water today vs. 1970 • Wasting water & energy while waiting

Dollar$ & Cent$ Gallons Per Day Natural Gas Electricity 60 60 Gallons Per Year 21, 900 BTU’s Used 16. 4 Million Efficiency 0. 6 0. 9 Cost Per Unit $0. 89/therm $0. 13/k. Wh Cost Per Year $275. 00 $700. 00 Assumes hot water is 90 degrees F above incoming cold water. Assumes ≈ 175’ of ½” copper pipe for hot water supply length. Cost per year has been rounded off. From US DOE

How Much Is Waste? Standard Distribution System Water/Sewer Nat Gas Elec Trunk & Branch plumbing, total cost $110 $275 $700 Portion of cost associated with waste ($36) ($92) ($232) $74 $183 $468 Portion of cost associated with actual use Heating with Natural Gas: Total cost for water/fuel = $ 385. 00 Portion wasted = $ 128. 00 % wasted ≈ 33% Water cost estimated at $0. 005/gallon combined; natural gas estimated at $0. 89/therm; electricity estimated at $0. 13/k. Wh

The Waiting Is The Hardest Part… • Larger homes, waste is greater! • DOE estimates up to 14, 000 gallons wasted for family of 4 • But then there’s the waiting…

Hot Water Recirculation • Economy + convenience • Saves water and energy… • Delivers hot water when/where it’s needed/wanted!

Trunk & Branch Plumbing

Full Loop Recirculation Hot Pump and Controls Water Heater Hot Water Piping ½ inch ¾ inch 1 inch

Half Loop Recirculation Pump Separated from Thermo-sensor Aquastat Hot Pump and Controls Hot Water Piping Water Heater ½ inch ¾ inch Hot

Half-Loop Recirculation Using the Cold Water Line as Return Pump, Valve, Control, Thermo-sensor

Simple Recirc Solutions • Taco Plumb n’ Plug® • Timer-controlled – Analog – 24 hr/15 min – Digital – 7 day/8 events • Optional aquastat hi/low limit – 950 – 1150 • Not recommended for use w/“tankless” type water heater • Available in 003, 006

Sizing – Based on Size & Length

D’Mand • Only runs on “demand” • Push-button/motion sensor • Mounts under sink or at water heater • Can be used with “tankless” type water heaters • Overall most energy efficient solution

Under Sink Installation

Water Heater Installation

Sizing Available in • 006 • 008 • 0011

With Tankless Water Heaters

Tankless With Recirc Line

Simple Sizing

Hot-Link!® • Timer “ 00” pump+ Bypass Valve • Uses cold line as “return”

Hot-Link Bypass Valve • Integral thermal sensor disc • Closes when 1100 – 1200 water reaches valve

Retro-fit Ready… • Install Hot-Link Valve under sink • Install Hot-Link circulator at water heater • Program, and presto!

A Case For Pipe Insulation • Speeds up hot water delivery • Keeps pipes hot for consecutive use • Reduces heat loss • Saves energy

Typical Hot Water Event Temperature Water Heater Temperature Useful Hot Water Temperature Delivery Use Cool Down Time

Temp Drop v Flow Rate, 100 Feet of ½” Cu Pipe Insulation cuts temp loss in half (Thot = 135 F, Tair = 67. 5 F)

Temp Drop to 1050 – ½” Pipe PEX No Ins Cu ¾ In R-4. 7 PEX ¾ In R-4. 7

Improvement With Insulation Temperature Water Heater Temperature Useful Hot Water Temperature Delivery Use Cool Down Time

Insulation & Recirculation • Plumb n’ Plug®, Hot-Link®, D’Mand – Faster delivery – Runs much less w/aquastat – Saves electricity – Saves LOTS of fuel