Boilers

By: Jason Ng

Objectives

Effectively compare and contrast different types of water heating systems in order to enlighten students about proper choice making when it comes to choosing a heating system for a home.

Selection Criteria

Types of water heaters Conventional Storage Demand water heaters Heat Pumps Solar Water heaters----------- Tankless coil or Indirect heaters

Energy Efficiency Fuel types Size

Tankless Coil Water Heaters

Provides hot water on demand, without a tank

Works most efficiently during cold months

Energy is wasted during warm months

Indirect Water Heaters

Storage tank required Allows boiler to work

less often More efficient for homes Works well with radiant

floor heating systems

Fuel Cost Comparison Chart

Estimated Annual Heating Cost for Selected Fuels

   Heating

Efficiency Fuel CostEnergy

use/1500ft2

Energy Cost for a well insulated 1500ft2 home

Electric Resistance 3413Btu/kWh 100% $0.03/kWh 23440kWh $703.20

Propane 92000Btu/gal 92% $0.90/gal 945gal $850.50

Natural Gas100000Btu/

therm 92% $0.70/therm 870therms $609.00

Efficiency Rating : Energy Factor (EF)

EF based on:Recovery efficiencyStand by lossesCycling losses

Higher EF = Higher Efficiency Higher EF does not necessarily mean

lower costs

Conclusion

After having listened and comprehended the information presented, one should now have enough understanding of water heating systems in order to make an informed decision about what kind of systems to use for different needs

References

http://www.eere.energy.gov/femp/technologies/eep_boilers.cfm

http://www.eere.energy.gov/consumer/your_home/water_heating/index.cfm/mytopic=13020

http://www.purityplanet.com/hot-water-heaters.aspx http://doityourself.com/waterheater/

hotwaterbuying.htm http://www.savemoreonheat.com/

residential_products/default.asp http://www.onesmartfart.com/home/water_heater.php