Solar Hot WaterSolar Hot Water

Presented byPresented by

Utah Solar & Alternative Utah Solar & Alternative EnergyEnergy

UNDERSTANDING SOLAR:UNDERSTANDING SOLAR:Current sources of energyCurrent sources of energy

SOLAR WATER HEATING IS AN SOLAR WATER HEATING IS AN ESTABLISHED TECHNOLOGY IN ESTABLISHED TECHNOLOGY IN

EUROPEEUROPE

© GSS

THE US HAS BETTER SOLAR THE US HAS BETTER SOLAR CONDITIONS THAN CONDITIONS THAN

EUROPE…EUROPE…

Not to scale

……BUT NORTH AMERICA TRAILS OTHER BUT NORTH AMERICA TRAILS OTHER COUNTRIES IN THE USE OF SWHCOUNTRIES IN THE USE OF SWH

0

100

200

300

400

500

600

700

800

China Germany Austria I srael Australia + NorthAmerica

Europe2020

M2 collector space installed/1000

inhabitants

6% 8%

26%

61%

5%

0,5%

26%

61%

Share of residential water heating met by installed collectors

Source: Sarasin, ESTIF. Note: Collectors used for commercial applications included. Europe 2020 is an industry projection for 2020

Closed loop glycol

TYPES OF SOLAR SYSTEMSTYPES OF SOLAR SYSTEMS

Thermo-Siphon

Drainback

Source: Home Power Magazine June/July 2005

Batch Water Heater

Open loop direct

k system

SOLAR THERMAL SOLAR THERMAL COLLECTOR TYPES and COLLECTOR TYPES and

APPLICATIONSAPPLICATIONS

Aesthetics

Flashing system

Concealed points of connection. Ideally suited for our environment.

© www.sole.gr

Roof integrated flatplate

Non-integrated flatplate

Vacuum tube collector

Unglazed collector

© Aquatherm Industries/ NREL Pix

Cheapest

Easy to install and transport. Ideally suited for pool heating.

Ad

van

tag

es

Theoretically the highest performance/Sq. ft. Better performance than flat plate at more northern latitudes.

© www.solarpraxis.com

ACTIVE CLOSED LOOP SOLAR ACTIVE CLOSED LOOP SOLAR WATER HEATING SYSTEMSWATER HEATING SYSTEMS

PRINCIPLE OF SOLAR THERMAL PRINCIPLE OF SOLAR THERMAL COLLECTION > 80% Efficient. COLLECTION > 80% Efficient.

SOLARSOLAR COLLECTORSCOLLECTORS WITHWITH VENTINGVENTING SKYLIGHTSKYLIGHT

SYSTEM CONTROLSYSTEM CONTROL

System Controller

• Protects system from overheating• Extends heat transfer fluid life • Can be used to meter solar energy

SOLAR THERMAL LOOPSOLAR THERMAL LOOP

EXPANSION TANK EXPANSION TANK OPERATIONOPERATION

Out of the box Solar System Filled,with collectors covered

Maximum Pressureat highest temperature

of heat transfer fluid

Heat Transfer Fluid Heat Transfer Fluid Heat Transfer Fluid

• Protects system from pressure buildup• Collects heat transfer fluid as it expands

ANTI-SCALD MIXING VALVE ANTI-SCALD MIXING VALVE

Temperature Adjustment Knob

Cold Water at street temp apx

50F

Solar Heated

water up to 180F

Tempered WaterSet To Code Max

120F

SYSTEM DESIGNSSYSTEM DESIGNS

• Stand alone tank either gas or electricStand alone tank either gas or electric

• Solar preheat for existing gas unitSolar preheat for existing gas unit

• Solar preheat for existing electric unitSolar preheat for existing electric unit

• Solar preheat for tank less heaterSolar preheat for tank less heater

• Solar preheat for boilerSolar preheat for boiler

• Boiler backed with dual heat exchangeBoiler backed with dual heat exchange

• Combination heat for space and Combination heat for space and domesticdomestic

SYSTEM INSTALLATIONSYSTEM INSTALLATION

Typical System CostsTypical System Costs Before Before Tax Credits or Utility RebateTax Credits or Utility Rebate

• 2 Panel / 80 Gallon Tank2 Panel / 80 Gallon Tank– $8,200 for new construction$8,200 for new construction– $9,200 for retrofit$9,200 for retrofit

• 3 Panel / 120 Gallon Tank3 Panel / 120 Gallon Tank– $9,500 for new construction$9,500 for new construction– $10,500 for retrofit$10,500 for retrofit

TAX CREDITS & REBATESTAX CREDITS & REBATES

• Federal Tax Credit: 30% of installed cost. Federal Tax Credit: 30% of installed cost. RefundableRefundable

• State Tax Credit through DNR 25% up to $2,000 State Tax Credit through DNR 25% up to $2,000 NONREFUNDABLE.NONREFUNDABLE.

• Questar Rebate of $750 when backing up gas hot Questar Rebate of $750 when backing up gas hot water heater or boiler. Retrofit only. water heater or boiler. Retrofit only.

SOLAR HOT WATER SYSTEMS YIELD SOLAR HOT WATER SYSTEMS YIELD FAST RETURNSFAST RETURNS

Source: Findsolar.com and SEIA 2006. Assuming switch from electric water heater. Utility subsidies may be higher in some instances. Sales tax exemptions not considered

0 10 20 30

Atlanta, GA

Charlotte, NC

St. Paul, MN

St. Louis, MO

Jersey City, NJ

Jacksonville, FL

Denver, CO

Portland, OR

Phoenix, AZ

Salt Lake City, Ut

Boston, MA

E. St Louis, IL

Los Angeles, CA

San Jose, CA

Honolulu, HI

Years

• Payback for 3-4 people Payback for 3-4 people family house w/80 family house w/80 gallon tankgallon tank

• Faster payback in new Faster payback in new build or when replacing build or when replacing water heaterwater heater

• Slower payback Slower payback switching from natural switching from natural gas in most areasgas in most areas

WARRANTYWARRANTY

• Product warranty:Product warranty:

• 10 years on collectors and flashing system10 years on collectors and flashing system

• 5 years on tank and all other components5 years on tank and all other components

• Warranty on labor:Warranty on labor:

• Installers to give 5 years labor warrantyInstallers to give 5 years labor warranty

KEY MESSAGES – WHY KEY MESSAGES – WHY SOLAR HOT WATER?SOLAR HOT WATER?

SOLAR WATER HEATING IS…SOLAR WATER HEATING IS…

… often the most cost

effective way to go “green”

for the average

homeowner

…supported by the Federal Government and several states with substantial tax credits

…a complete system proven

for years in Europe

… installed by qualified and competent

professionals –

…safe, low maintenance,

and great looking

QUESTIONSQUESTIONS

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