Pros And Cons Of A Demand Water Heater

A demand water heater is a tankless system that only heats the water coming through your pipes when you turn on a hot faucet in your home. There are pros and cons to this system that need to be considered before you can determine whether this is the right type of system for you. If you're still undecided, contact a water heater installation company for more information and a consultation.

Here are some of the key pros and cons to the demand water heater system.

Pro: Highly Energy Efficient

The lack of a tank means a demand heater doesn't keep a storage supply full of heated water at all times. The on-demand use of both your home's water supply and the electricity or gas needed to heat the water means that the tankless demand water heater is far more efficient than a traditional tanked water heater -- even when that tanked water heater meets the minimum qualifications for the Energy Star certification from the United States government.

A tankless water heater is approximately 45 to 60 percent more efficient than a baseline storage tank type unit and about 40 percent more efficient than a high efficiency storage tank. This puts a tankless water heater near the efficiency of heat pump systems, which have a tank but draw the heat source from the surrounding air, and towards the lower end of the efficiency savings range for a solar system.

This high efficiency means that a tankless water heater can cut your energy costs significantly if you are upgrading from a traditional tanked water heater.

Pro: Long Lifetime and Easier Repairs

The lifespan of a hot water heater is often determined by when the tank is at risk of failing. Mineralization inside the water, and the water itself, will gradually start to wear down the interior lining even with an anode rod present to attract away some of that mineralization. A tankless water heater doesn't have a tank so there's no risk of it failing and the lifespan is mostly down to the mechanical parts.

High efficiency tanked water heaters and heat pump systems both have a maximum lifespan of about a decade. Tankless water heaters can last up to 20 years, which is on par with a solar water heater setup. And the lack of tank and durability of machinery also means that demand water heaters are easier for a water heater repair service to work on if something does go wrong.

Cons: Higher Initial Cost

The main downside to a tankless water heater is the higher initial cost for both the system and the water heater installation. That cost will pay off over time through energy savings, but some homeowners simply can't swing the cost of a tankless water heater when a tanked water heater fails and needs a replacement. Visit for more information.