All modern houses are connected to the central water supply. But not all residents are satisfied with the quality of service of utilities, so they install boilers in private homes and apartments. In order not to make a mistake with the choice of equipment, you need to correctly calculate the volume of the water heater. We will share with you the calculation formulas and rules that will help you choose the device for the whole family.
How to choose a boiler volume
Before you go to the store for appliances, determine the amount of water consumed. Another important criterion is the heating rate and flow rate.
What to consider when buying:
- The number of people who will use the device.
- The number of sampling points.
- Use a bath or shower to wash.
Habits of people also affect the amount of fluid consumed. What time does each family member take a shower? If it is day and evening, then the number of liters will decrease, because during this period of time the boiler will have time to heat the next portion of water. A large stock of storage tank will not be superfluous, especially for a private house.
How many liters does a standard appliance hold? From 30 to 150. A water tank of 30-50 liters is enough to service one point of the fence. For example, you can place equipment near the sink. There are more volumetric devices for 500 liters. Such are more often used in industrial activities.
Indirect water heaters are connected to the heating system, their capacity is also great. They provide not only a sink and shower with hot water, but also batteries.
Conventionally, for two or three people in the family, 80-100 liters are enough. However, in order to accurately select the equipment, it is necessary to carry out the calculation.
How to calculate tank capacity
For a family of 4 people, capacity can be calculated using the following formula:
P x (t ° - t1) / (t2 - t1)
R - This is the amount of fluid you need for daily use. To calculate this indicator, consider what the water is spent on. For example: you need 5 liters to take a shower. You take it within 10 minutes. So: 5 x 10 x 4 (number of people) = 200.
t ° — outlet water temperature. For normal use without mixing, 38 degrees is enough.
t1 — input temperature; in summer it can reach 16 ° C, in winter 9 ° C.
t2 - heating temperature; can reach 85-90 degrees.
It remains to substitute specific numbers and calculate the size and capacity of the tank. Products over 150 liters are not hung on the wall, but are installed on the floor. To accommodate them, you need enough space.
No need to think that you will have a net consumption of hot water. If you prefer to take a bath, then the hot stream will be diluted with cold to achieve a comfortable temperature.
Experts recommend installing heat no more than 55 degrees. This will avoid the formation of scale and its deposition on the details of the boiler.
Selection of instantaneous water heater is performed in the same way. However, the liquid preparation time is calculated by another formula:
Pm = Q / ((Ttv-Txv) * 1.163)
R - amount of fluid consumed.
Q - power of the device, which is indicated in the documentation.
Ttv and Tkhv - temperature of warm and cold water.