The problem of hot water supply is solved in different ways. In some cases it is more expedient to simplify the task and use the flow type of water heaters. Their main advantages are compactness( hence, lower cost compared to analogues) and speed. But this is the best model to buy - this issue requires detailed consideration.
Criteria for choosing
The assortment of instruments is so huge that the purchase of such an electric / water heater causes certain difficulties. Not only advertising, but also sellers give a lot of arguments in favor of this or that choice. Only here is the guarantee that "this is exactly what" is vital for us and will satisfy our needs completely? Do the specialists of the outlets know where we live, how our life is arranged, the features of the water supply system and much more? And if yes, what is more important for them - our well-being or sales volume? The questions are far from rhetorical.
Any acquisition must be informed and justified. To buy the best variant of a water heater and at the same time do not overpay, you need to know some basic rules, and everything else - shape, design and so on - is already at the buyer's discretion, since such parameters have no influence on the functioning of the water heater.
Pressure models
Advantages
- Hot water, with appropriate "wiring" of the trunk, can be obtained in any room. The number of points to be connected depends on the design features of the water heater.
- Different possibilities for connecting pipes( bottom or top), which simplifies the choice( and installation) of the most convenient option.
- Switching on / off occurs under the influence of the head of the flowing liquid, automatically. It is enough just to open / close one of the water valves, and this is an undeniable convenience of operation.
- Large power range.
Cons
- The complexity of installing the entire contour. Even if you have to work with plastic pipes, not everyone will be able to connect them reliably to avoid the possibility of leaks. As a rule, employers have to pay for the work of professionals.
- In order for the system to function effectively, an accurate calculation of all parameters is necessary. And this is yet another difficulty for the inexperienced person.
Free-flowing models
Pros
- Low cost both for the water heater itself and for its installation.
- Compact( small dimensions allow to install in almost any place convenient for the hosts).
Cons
- Low power( up to 8 kW).
- Ability to work on only one tap. If you need hot water, for example, in the kitchen and in the bathroom, you will have to buy 2 appliances.
Power
This parameter requires at least an approximate calculation. What to consider - how much hot water will be needed? You can focus on such averaged data:
| Specificity of water use | Liquid temperature( 0С) | Consumption( l / min) | |
| Kitchen | mixer | 46 - 50 | 4 |
| Bathroom | shower | 35 - 38 | 6 |
| tap | 36 | 3,5 | |
| bath filling | 37 - 39 | 9 |
For approximate calculations use the simplest formula:
As a rule, the temperature of the liquid in the water pipe( at the inlet to the water heater) is 5 ° C.This is enough to get an approximate value of power.
There is an option for determining the flow of water according to the instrument documentation. If you first know its required flow, it can be calculated for this model approximately by dividing the passport power by 2. This will help you to understand whether the given water heater will satisfy the user's needs( under condition of heating up to 35 ºС).
But there is a nuance. Is it acceptable for all household members to take bath procedures at this temperature? Maybe someone likes taking a contrast shower? In order not to make a mistake with the purchase, it is desirable to increase the result of power calculations by 15-20%.Whether it is not enough that.
Housing version
It must be protected against liquids, since similar devices are installed either in utility rooms( pressure type) or in rooms with excessive humidity. The cheapest options are plastic and stainless steel.
Type of heating element
One of two - a heater or a spiral. Concerning the latter, attention should be paid to its protection against liquid. How and how effectively is it provided( type of insulation)?
Control method
Hydraulic or electronic. This is already more convenient for anyone, but it's worth noting( this applies to any technique) that the more complex the design, the more frequent the breakdown. And every repair has a monetary expression.
Everything else - the type of power( number of phases), various options( for example, remote control) and protection - at the discretion of the buyer. Here, everyone is guided by their own preferences and operating conditions of the product.
Price
For electric / water heaters of flow type starts from 6 080 rubles.
The article considers only the main aspects of the problem of choice. It does not impose any opinion, but provides an objective analysis of the characteristics of various hot water / water heaters. And which model to purchase( in view of the information provided), you decide, dear reader.
For the residential house the best option is about 9 kW .But if other devices are included at the same time( and in fact this happens), will the automatic protection device work at the input? This means that if you need such a water heater, you will have to reconcile it with the supplier of electrical energy beforehand.
