Water Heater Under The Sink Pros And Cons
If you install a small water heater under the sink in the kitchen or bathroom, you can save space, which is very important for rooms where there is a shortage of space. Such equipment is installed not only in private houses but also in comfortable apartments.
There are several reasons for installing such equipment. I must admit that they greatly influence the choice of the model that you are looking for.
- In the case when there is no hot water supply. In such rooms, you can install a small water heater under the sink. But not only. And a large-volume storage boiler for the bath.
- For use in summer. Every year in cities with the onset of summer, hot water is turned off as planned. This is necessary to diagnose and repair waterways.
- In case of hot water shutdown in case of emergency. This usually happens when the house is doing construction work or replacing pipes.
IMPORTANT! A ten-liter water heater can easily fit under the sink. And no hassle.
- Varieties of compact water heaters
- What sizes of a water heater are optimal
- We select the power of the water heater
- Do not forget about the safety of the water heater
- The best models have a residual current device.
- How to properly mount a water heater under the sink
- The installation process is as follows.
Varieties of compact water heaters
Before choosing something, you need to decide for what purpose you will use the water heater. The type of device that you are going to buy largely depends on this. Each water heater is a pair of pipes and a heating element. It is he who makes hot water from cold.
Electrical equipment is very popular nowadays. This is because gas burners cannot always be installed indoors. After all, they may have some design features. And depending on what the principle of operation is, electric water heaters were divided into two types.
- In flowing devices, water, when it passes through a powerful heating element, immediately enters the tap. The power of the heating element in such devices is high. It is 3-27 kW. Such a load leads to the fact that in some cases the wiring will not withstand. Powerful equipment needs a three-phase connection.
- The storage option has a large capacity for storing water supplies. This is how it differs from the flow-through version. Such a container takes up a lot of space under the sink. However, the storage device outperforms the flow device in performance.
IMPORTANT! There is a simple explanation for this. The water in the storage tank is first heated. This takes some time. And only after that, the liquid enters the tap.
Note also that the power of the heating element is lower. This equipment is suitable to be connected to a regular outlet.
This means that the flow-through device heats the entire flow of water at once, and the storage boiler takes some time for this.
IMPORTANT! When the water is used up, the cold water enters the tank. There it mixes with water that has already been heated. If there is not enough time for the heating element, the outlet liquid temperature will gradually decrease.
What sizes of a water heater are optimal
A small-capacity storage water heater is quite suitable under the sink. Let’s say 10-15 liters. But you can also use a device with a flow-through principle of operation. Naturally, if you choose the installation of the second option, then know that you will have more free space. However, you should remember that not all wiring can withstand its powerful heating element.
The 10-liter option is suitable for a small family in which there are two people. For one person, the supply of water will even be excessive. However, in this case, you can get savings on electricity. If your plans include installing a tank for one person, then a flow-through version may well work.
The 15-liter option can be recommended for a private house or apartment when there is a middle-aged child in the family. Caring for a small child already suggests that he will need more water for himself. In this case, the tank may not be able to withstand the heavy load.
The 20-liter model is currently one of the most optimal. Hence the demand for it. With careful use of the water supply, two adults can shower without any problems. For those who live in a private house, this is important. And in the kitchen, you can do business, since there will be enough water, whatever the cost of it.
IMPORTANT! Experts have calculated that this volume is enough to wash all the dishes after 5 people have had a grand dinner at the table.
Do not forget only that when you choose one model from several, which have the same volume, but different sizes, it is better to buy the larger one. After all, they have a thicker insulation layer. Therefore, the water stays hot longer.
We select the power of the water heater
Many other parameters depend on the power. Let’s say the speed of water heating and the energy efficiency of the device. However, in many apartment buildings, it is problematic to establish a powerful model. After all, the wiring may not withstand.
You can install a boiler yourself, the power of which does not exceed 5 kW. Devices of higher power are connected directly to the panel. To do this, use separate wire or three-phase networks.
When choosing a low-power heater, then give preference to the storage model. Let’s say an oversized device with a capacity of 0.8 kW. Instantaneous boilers, which can be installed on a tap in the kitchen, consume approximately 7 kW.
Do not forget about the safety of the water heater
An electric water heater is dangerous because it concentrates both water and electric current. That is why safety rules cannot be neglected.
The best models have a residual current device.
And it turns on as soon as problems appear in the power grid. There should also be protection against overheating of the liquid and automatic shutdown when there is no water in the pipes. The device must have a ground connection.
A water heater for a sink must have a safety group, which includes a pressure regulator. This is a reliable protection of the device against water hammers. When the pressure in the network is more than 4.5 atm, then devices with a small tank need an additional pressure reducer in front of the safety valve. Install it.
IMPORTANT! To collect excess water between the valve and the main tank, an expansion tank can be installed. Excess water is generated when the water is heated by the heating element.
The following tasks are assigned to the check valve of the storage boiler:
- Do not allow water to flow back into the line. It ensures that the tank is filled. Otherwise, the heating element, which will not be completely in the water, will fail during operation.
- It is also an emergency option when it is necessary to drain the water from the tank. Let’s say when dismantling or repair is being carried out.
- Protect the inner tank from bursting. This is quite possible if the thermostat does not work due to a malfunction and the heating element heats the water so much that it even boils.
IMPORTANT! It is installed during the installation of the water heater where cold water enters the boiler. If it is faulty, then this is noticeable by the way hot water flows from the cold tap. If this happens, then urgently carry out the protective device.
How to properly mount a water heater under the sink
As a rule, all the materials that you may need to install and connect this equipment are provided in the package. If they are not there, then each such element must be purchased before proceeding with the installation. In particular, it is not so rare in budget models that there is no check valve.
The installation process is as follows.
The pipes of the water heater are equipped with shut-off valves. Install a safety check valve on the cold water pipe, a tap on it, and then an adapter for a metal-plastic pipe.
You only need to install a tap on the hot water pipe, as well as an adapter for a metal-plastic pipe. Instead of polypropylene pipes, you can also use a flexible hose. It is usually included in the kit. However, the first option is preferable. It is more reliable. In addition, pipes are made of metal-plastic with a large diameter, and this leads to a decrease in pressure and an improvement in the water supply.
We dismantle the flexible hoses of the mixer. We install tees at the water intake point after the locking taps on the water supply. From the cold water supply pipe – to supply it to the boiler. From the hot water pipe – to switch and turn off the hot water.
IMPORTANT! To connect the tank, you need the appropriate connections. During operation, each connection must be sealed.
So that there are no puddles on the floor from the safety valve, we recommend that you install a drain from the drainpipe with an outlet to the sewer or some kind of container.
This electrical equipment needs a socket to be connected to the water heater. For the equipment in the panel to have protection, a local automatic device must be provided.
IMPORTANT! It is possible to set the required water temperature and connect the heating elements of the water heater only when the tank is filled.
Water Heater Under The Sink Pros And Cons
For those who have a small room, we recommend a water heater under the sink. This will be the best option. The type of equipment must be chosen so that it corresponds to the purpose of the device. And so does the number of consumers.
Everyone can do this kind of work with their own hands. However, for those who have not previously dealt with plumbing equipment, we advise you to invite specialists for such work.