Tankless Water Heaters

Tankless

Condensing Tankless Gas Water Heater

Condensing tankless heaters use a secondary heat exchanger that uses exhaust to pre-heat the water before it reaches the primary exchanger resulting in higher efficiencies. The GSW powered by Takagi condensing tankless water heaters are state-of-the-art with a Universal Energy Factor of 0.93.

Discontinued: Non-Condensing Tankless Gas Water Heater

Non-condensing tankless heaters use a single heat exchanger to heat the water as it passes through it. The GSW powered by Takagi non-condensing tankless water heaters can provide you endless hot water when sized properly.

Space Saver® Electric Tankless

The Space Saver^® point of use electric tankless water heater puts hot water right where you need it.

FAQs

Tankless water heaters

My water is not hot enough

If the water coming out of your heater is not hot enough there could be a few different issues. Some of these will require work to be done by a certified HVAC technician.

The temperature could be set too low. When the unit is shipped out it will be set at 120°F. Check what the water temperature is set at by looking at either the LCD display on the front of the unit. If there is no LCD refer to the remote included with the heater.
Check for cross plumbing between cold water lines and hot water lines. To do this, turn off the cold water supply and turn on a hot water fixture. The water at the fixture should eventually completely stop flowing. If water continues to run you have crossed plumbing and should contact a plumber.
Unit may be hard water scaled. The scale acts as an insulator preventing the heat exchanger from transferring heat to the water. Refer to your installation manual for descaling procedures.
The unit may not be receiving enough gas. There are a various reasons this could be happening. Contact a certified HVAC technician.
If the LCD display on the front of the heater or your remote has a flashing 101 it means there is a 101 error code. A 101 error code indicates there is a combustion issue and you should contact a certified HVAC technician.
Check for dust, debris or anything in the venting outside your house and inside the unit itself. If there is debris in the venting you may be able to safely remove it. If there is dust inside the unit, there will also be dust inside the burner and heat exchanger. Contact a certified HVAC technician.

The temperature fluctuates when a fixture is opened.

If the water temperature fluctuates while the water is running there are a few possible issues.

Check for cross plumbing between cold water lines and hot water lines. To do this turn off the cold water supply and turn on a hot water fixture. The water at the fixture should eventually completely stop flowing. If water continues to run you have crossed plumbing and should contact a plumber.
The filter on cold water inlet should be clean; look for signs of hard water scaling. If found Refer to your installation manual for descaling procedures.
On well systems or even on some city water systems, water pressure fluctuations (especially on low flow) of 8 to 10 psi will result in flow rate fluctuations, which will in turn result in minor temperature fluctuations.
There could be an issue your gas supply or venting. Contact a certified HVAC technician.

The heater has power, gas and water but doesn’t turn on.

If the heater was just installed it may have been installed incorrectly. If this is not the case there may be an issue with the flow sensor, which will require a certified HVAC technician. Alternately, the filter may need to be cleaned.

To clean the filter, the unit must first be drained:

Close the manual gas shut off valve.
Turn off power to the unit, and then turn on again.
Wait 30 seconds, and then turn off power to the unit again.
Close the cold water inlet shutoff valve.
Open all hot water taps in the house to remove the initial pressure.
When the residual water flow has ceased, close all hot water taps.
Unscrew the drain plugs (hot water outlet drain plug and cold water inlet filter) to drain the remaining water out of the unit. Have a bucket or pan to catch the water from the unit’s drain plugs.
Wait a few minutes to ensure all water has completely drained from unit.
Check the water filter located within the cold inlet.
With a tiny brush, clean the water filter of any debris which may have accumulated and reinsert the filter back into the cold water inlet.
Securely screw the filter

It takes a long time to get hot water at the fixtures.

It is common that a tankless unit will require more time for hot water to arrive at the faucet. The time it takes to deliver hot water to your fixtures depends on the length of piping between the two. The longer the distance or the bigger the pipes, the longer it will take to get hot water. If this is the case and you would like to receive hot water to your fixtures quicker, you may want to consider a hot water recirculation system. If you already have a recirculation system there may be an issue with it and you should contact a certified HVAC technician.

GSW builds its water heaters to be safe, energy efficient and reliable.

Many components, like our exclusive Turbulator dip tube, are available on many models and can help maintain optimum efficiency and extend tank life by reducing sediment at the bottom of the tank.

Find the right water heater for you