Under-The-Sink On-Demand Water Heater
An under-the-sink on-demand water heater, also called an instant or tankless water heater, is a great way to get hot water when you need it without having to wait for a tank to fill up. These units are small and compact, so they can be easily installed under the sink in your kitchen or bathroom. They're also very efficient, so you'll save money on your energy bills.
How Do On-Demand Water Heaters Work?
On-demand water heaters work by heating water as it flows through the unit. This means that you don't have to wait for a tank to fill up before you can get hot water. The unit will heat the water to the desired temperature and deliver it to your faucet or showerhead immediately.
On-demand water heaters are powered by electricity or gas. Electric models are typically more expensive to purchase and install, but they're more efficient than gas models. Gas models are less expensive to purchase and install, but they're not as efficient as electric models.
Benefits of Under-The-Sink On-Demand Water Heaters
There are many benefits to installing an under-the-sink on-demand water heater, including:
- Endless hot water: You'll never run out of hot water with an on-demand water heater. The unit will heat water as it flows through the unit, so you can always get hot water when you need it.
- Energy efficiency: On-demand water heaters are very efficient, so you'll save money on your energy bills. The unit will only heat water when you need it, so you won't be wasting energy heating water that you're not going to use.
- Compact size: On-demand water heaters are small and compact, so they can be easily installed under the sink in your kitchen or bathroom. They won't take up a lot of space, so you can still have plenty of room for other items.
- Easy to install: On-demand water heaters are easy to install. You can usually install the unit yourself in a few hours.
Choosing the Right On-Demand Water Heater
When choosing an on-demand water heater, there are a few things you need to consider, including:
- Flow rate: The flow rate of an on-demand water heater is the amount of water that the unit can deliver per minute. You'll need to choose a unit with a flow rate that is high enough to meet your needs. If you have a large household, you'll need a unit with a higher flow rate.
- Temperature range: The temperature range of an on-demand water heater is the range of temperatures that the unit can heat water to. You'll need to choose a unit with a temperature range that is high enough to meet your needs. If you want to be able to take hot showers, you'll need a unit with a high temperature range.
- Energy efficiency: The energy efficiency of an on-demand water heater is measured by its Energy Factor (EF). The EF is a measure of how much energy the unit uses to heat water. The higher the EF, the more efficient the unit. You'll want to choose a unit with a high EF to save money on your energy bills.
Installing an On-Demand Water Heater
Installing an on-demand water heater is a relatively simple process. You can usually install the unit yourself in a few hours. However, it's important to follow the manufacturer's instructions carefully to ensure that the unit is installed correctly.
Here are the general steps involved in installing an on-demand water heater:
- Turn off the water supply.
- Disconnect the old water heater.
- Install the new on-demand water heater.
- Connect the water supply.
- Turn on the water supply.
- Test the on-demand water heater.
Maintenance
On-demand water heaters require very little maintenance. However, you should inspect the unit regularly for leaks or other problems. You should also clean the unit's filter every few months to prevent sediment from building up.

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