Latest Asked Questions

Gas tankless water heaters are gradually replacing traditional reservoir water heaters. The reason for that is that gas tankless water heaters are much more convenient and effective. What is more they require minimum maintenance and in general more reliable.

Many people nowadays are thinking of buying a gas tankless water heater - best tankless water heater for their home or work.

Here are some important things to keep in mind while choosing gas tankless water heater.

Requirements to gas supply

In comparison with conventional hot water heaters gas tankles water heaters heat water for a short while when the hot water is needed. It saves a lot of money, however requires rather big supply of gas for short periods.  Some models, for example Bosch 2700ES NG, need a 3/4 inch gas line to guarantee that the water heater has enough fuel to operate.

In this respect it is necessary to mention that in older houses there is only a 1/2 inch gas line, which is evidently insufficient. In this case it is necessary to upgrade the line before buying a gas tankless water heater.

Choosing the proper location

Tankless gas water heaters are evolving and only cutting-edge technologies are applied to them so that you can enjoy their operation. Nevertheless it still takes a few minutes for hot water to reach the required outlet in your kitchen or bathroom. To reduce this time it is a good idea to locate gas tankless water heater as close to the outlet as it is possible. With that, however, you might face some problems, because issues of venting are incredibly important in respect of gas tankless water heaters. To find out the proper distances consult a professional plumber. He will definitely find the right place for your tankless water heater to be installed.

Installing electric point-of-use water heater might be an option if there are some problems with location.

Water pressure

Being quite far from plumbing, a lot of people don't really know how important it is to have a proper water pressure. The thing is that water heaters require specific water pressure. It is a good idea to find out what the water pressure in your house is, before using the water heater. It will definitely prevent some problems from occurring.

Venting and Combustion

Gas tankless hot water heaters burn a lot of gas in a short while. In this respect they surpass conventional heaters and even furnaces. It enables them to provide instant hot water. However, it requires specific measures to be taken.

To guarantee safe and effective combustion the water heater is to be located at a well ventilated area. Placing gas tankless water heater in an attic is basically good idea, as there air circulation corresponds to the venting requirements. The alternative with installation of an intake duck leading outside the house adds more good also solves the problem of ventilation.

While the unit is running, the amount of exhausts might be pretty big. The ducting should be of stainless steel and should be in accordance with all standards. The thing is that buying all the equipment, in case your house doesn't meet the requirements, is likely to double the price of gas tankless hot water heater.

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Water Heater Power
 kW
Water Flow (Per Minute)
 Gallons
See Table "Typical Flow Rates"
Incoming Water Temperature
 °F
Output Water Temperature
 °F

Fixture Type Gallons (Liters) Per Minute
Lavatory
0.5 (1.9)
Bathtub
2-4 (7.6-15.2)
Shower
1.5-3 (5.7-11.4)
Kitchen Sink
1-1.5 (3.8-5.7)
Pantry Sink
1.5-2.5 (5.7-9.5)
Laundry Sink
2.5-3 (9.5-11.4)
Dishwasher
1-3 (3.8-11.4)

Activity Gallons (Liters) Using
Clothes washing
32 (121)
Showering
20 (76)
Bathing
20 (76)
Automatic dishwashing
12 (45)
Preparing food
5 (19)
Hand dishwashing
4 (15)
Source : ACEEE

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