How to Choose a Tankless Water Heater

With winter coming you may be considering how you can heat your home better in the coming colder months. Water heaters are a good way of doing this if you did not want to install an overly expensive system. If you did get a new water heater or install one then you may be interested in learning about how you could tankless as well. The first necessary condition is a suitable hydraulic, with piping for cold water, for hot water, and for the gas that will feed the heater, which can be LPG (liquefied petroleum gas) or NG (natural gas).

We need to choose a tankless water heater, based on the consumption points we want to have hot water.

Tankless Water Heater


For sizing the passage heater, the variables that are taken into account are:

– Number of consumption points: Check the number of consumption points that will be served to determine the heater capacity:

  • 8 Liters – It has a bathroom with shower.
  • 10 to 15 Liters – Provides a bathroom: a shower, possibly serving a shower and a faucet simultaneously;
  • 18 to 20 liters – It serves a bathroom, being able to serve two nearby bathrooms with showers of 8 liters of flow, especially in summer.
  • 22 to 26 Liters – Serves two bathrooms, with showers with a maximum of 10 liters of flow.

– Distance from the heater to the most unfavorable consumption point:

The distance from the heater to the point of consumption is essential for a good performance of the equipment.

The greater the distance from the heater to the point of consumption, the greater the loss of temperature.

Considering that I can have a loss of up to 1 C/m and the passage heater at its nominal flow rate raises the water temperature by + 20 C, if the farthest point is at a distance of 12 m, loss can reach 12 C

– Minimum operating pressure and flow.

The minimum water column between the bottom of the box and the highest consumption point must not be less than 8 to 10 mca (meters of water column). This distance depends on each manufacturer’s product.

To ensure smooth working of this tankless water heater, consider tankless water heater, repair and installs in Elgin Illinoisc.