For Hot Water Heaters, consider: Drain-Water Heat Recovery, Energy Star Water Heaters, Flash and On Demand Water Heaters, Gas and Electric Water Heaters, Heat Traps, Hot Water Heater Timers, hot Water Pipe Insulation, Solar Water Heaters, Tankless Water Heaters, and Water Meter Reading.
If your current tank hot water heater is coming due for replacement, consider a ‘Tankless’ or ‘On-Demand’ hot water heater. Demand water heaters also referred to as ‘instantaneous’ or ‘flash’ heaters provide hot water only as it is needed. They do not produce the standby energy losses associated with typical tank storage water heaters, so you can save money.
How They Work: When a hot water tap is turned on, cold water travels through a pipe into the unit. Either a gas burner or an electric element heats the water. As a result, demand water heaters deliver a constant supply of hot water. You don't need to wait for a storage tank to fill up with enough hot water. However, a demand water heater's output limits the flow rate. Typically, demand water heaters provide hot water at a rate of 2–5 gallons (7.6–15.2 liters) per minute. Gas-fired demand water heaters produce higher flow rates than electric ones. Sometimes, however, even the largest, gas-fired model cannot supply enough hot water for simultaneous, multiple uses in large households. To put this in perspective a typical shower may use 2.5 gallons per minute, so if you have ‘rush-hour’ at your house for morning showers and want to run three simultaneously, you can look into the units that have a flow rate of 7 or more gallons per minute. The higher the flow rate, the larger the cost, but the relative cost is marginal.
Other applications for demand water heaters include the following:
- Remote bathrooms or hot tubs
- Booster for appliances, such as dishwashers or clothes washers
- Booster for a solar water heating system.
Although gas-fired demand water heaters tend to have higher flow rates than electric ones, they can waste energy if they have a constantly burning pilot light. This can sometimes offset the elimination of standby energy losses when compared to a storage water heater. In a gas-fired storage water heater, the pilot light heats the water in the tank so the energy isn't wasted. The cost of operating a pilot light in a demand water heater varies from model to model. Ask the manufacturer how much gas the pilot light uses for the model you're considering. If you purchase a model that uses a standing pilot light, you can always turn it off when it's not in use to save energy. Also consider models that have an intermittent ignition device (IID) instead of a standing pilot light. This device resembles the spark ignition device on some gas kitchen ranges and ovens.
For homes that use 41 gallons or less of hot water daily, demand water heaters can be 24%–34% more energy efficient than conventional storage tank water heaters. They can be 8%–14% more energy efficient for homes that use a lot of hot water—around 86 gallons per day. You can achieve even greater energy savings of 27%–50% if you install a demand water heater at each hot water outlet.
The right home improvement products, techniques, and services:
Contractors, home improvement stores, and specialty shops in your area may not yet have a complete familiarity with the ‘green’ opportunities, products, system integration, and overall savings potential. So, you may get some resistance, since people in general are typically more comfortable recommending something that they are already familiar with rather than something new. To help break the inertia, use the information across this website like our Return on Investment Master ROI Table. Also feel free to post a question in our forum on the message board about a particular need for your home relative to your area. Our team has spent multiple years aggregating research from public and private sector performance reports and from manufacturers and homeowners across the country in order to provide you with the perspective you may need to see the initial payback and long term advantages. Environmental enthusiasts and leading institutions like the American Institute of Architects and the National Association of Realtors, see the value and link into our resources to support their members.
The Green Home:
For your overall home improvement, you can save money, improve your family’s health, and save the planet. Find out for free how much it will cost to do different types of home improvement in your home from a qualified and member approved contractor in your area. Get a FREE Quote . Plus, regardless of the size and scope of your home improvement project, save money and keep your home clean with the top rated chemical free and concentrated Green Home Cleaning Products.
Home Improvement Basics:
When it comes to home improvement basics, look for interior home improvements like creating a clean, safe, and healthy home through sustainable ‘green’ furniture, home décor, zero VOC and Interior Paint, plus ENERGY STAR Appliances and Electronics. For energy and utility savings you can focus on insulation and air sealing, windows, doors, lighting and skylights, water saving plumbing opportunities, and high efficiency heating and air conditioning systems. On the outside of your house, look for exterior home improvement opportunities through landscape design and gardening plus solar energy, wind and other power sources. If you are undertaking a major home renovation, an additions, or building a new home, then take the lead to ‘go green’ in as many ways as possible to save money and the environment.