Domestic Water Plant Comparison 2018

Purchase advice for the domestic water plant comparison or test 2018

  • Domestic water works are particularly well suited for short dosed water withdrawals for home and garden. For the removal of large amounts of water such as. In the management of large lawns or the filling of a pool, however, home automation are better.
  • You can also purchase drinking water from the public utility with your domestic waterworks to supply the entire house. This may be necessary if the pressure supplied by the supplier is insufficient. In this case you can use the domestic waterworks to increase the pressure of the piping system.
  • If you only want to supply your garden with service or rain water from a rain barrel or cistern, it may be worth considering buying a garden pump or rain barrel pump.

Domestic Water Plant Comparison 2018: domestic

The supply of water is an important topic worldwide. Everyone needs it - whether for cooking, showering, drinking or washing. Since there can be no life without water and the human body itself is about 65 percent water on average, we rely on replenishing our memory over and over again.

In contrast to many other countries, all inhabited buildings in Germany are connected to the public drinking water supply. There the prices for water in the last few decades though increased sharply Every homeowner should ask themselves if there is no cheaper alternative, at least for tap water.

For all who want to save in the long term and the environment to do something good, could the purchase of a Private water supply system, also Water works be of interest. With the right models, you can easily use rain or well water for your washing machine, toilet flush or irrigating your garden. In order to find out what a domestic waterworks should be able to do, what advantages and disadvantages it has and what to look out for when buying, we have the best domestic waterworks in our house water test 2018 (including house water test winner and price-performance test winner) and the most important information collected for you.

  • environmentally and resource friendly
  • independent water supply
  • long-term savings compared to public utilities
  • Protection of washing devices
  • expensive to maintain

1. What is a domestic waterworks and how does it work?

Domestic Water Plant Comparison 2018: comparison

inexpensive model of a domestic waterworks Einhell

Main waterworks are self-supply systems for drinking and service water. This turns water into a reservoir line network pumped. This is primarily the Water extraction from wells and waters, With pure hot water use can also rain water from a cistern to be used. Domestic water supply systems are used in particular for properties or farmsteads that are not connected to the public drinking water supply. They are also commonly used in garden colonies and allotments.

In principle, a domestic water plant consists of three to max. four components:

  • a pump
  • a pressure vessel
  • a manometer
  • a safety valve

1.1. Which pumps are used?

centrifugal pumps

Centrifugal pumps use centrifugal force to deliver water. Via a suction pipe, the water is sucked into the pump and carried by means of a rotating impeller on a spiral path to the outside. As a result of the increasing pressure to the outside within the pump, the water can be conveyed into the pressure vessel.

As a rule, depending on the printing requirements, so-called one-stage or multi-stage processes can be found centrifugal pumps Use. Many centrifugal pumps are also at the same time submersible pumps, This means that they are immersed directly in the water. Submersible pumps are therefore ideal for domestic water supply systems because, in contrast to other pumps, they produce significantly less noise. Also, the operating costs are lower and their associated efficiency is higher in direct comparison. If no submersible pumps are used, the water will be over one Suction transported to the pump. In order to filter the water before it is sucked in, especially when using rainwater, it is recommended to use a water jet at the front end prefilter to install.

Domestic Water Plant Comparison 2018: water

AWM 7m suction hose with suction filter for coarse dirt and non-return valve.

A high quality water pump should also have a mechanism for Trockenaufsicherung respectively. In order to ensure that no water can flow back from the line into the tank during automatic shutdown, good pumps also have one Check valve. For high quality also speaks, if your domestic water plant is made of stainless steel. Especially your pump should be made for a long life of chrome-nickel steel, stainless steel and cast steel.

Tip: Dry accumulation means that the pump can switch off automatically if the electrode frequently used in the storage tank reports too low a water level. This can prevent overheating and damage to the device.

1.2. pressure vessel

An important component of the domestic waterworks is the pressure vessel. It is often used as a hydrophore or membrane container. There is one in it gasthat from the incoming water compressed and then approaches a preset maximum value (maximum pressure). As soon as this value is reached, the pump switches off. If you take water through a tap, the gas can expand again to a certain minimum value, from which, when it has been reached, the pump starts again. These values ​​can also be customized via the pressure switch to adjust.

This process is monitored and regulated automatically by a pressure switchwho uses the device u. a. protects against high pressure surges. Small systems, however, do not necessarily have a pressure vessel. It is enough for them if they are with one Pressure and flow waxes are equipped.

1.3. Pressure gauge and safety valve

For constant pressure control, a pressure gauge is often installed, regardless of the size of the system. In addition, a safety valve may be present. Safety valves are always prescribed when the operating pressure of the pressure vessel the delivery pressure exceeds by more than 10 percent. If the impermissible limit in the pressure vessel is exceeded, the gas will flow through the safety valve into the the atmosphere or one collecting device issued. By this measure, both accidents and serious damage to the device can be avoided.

Domestic Water Plant Comparison 2018: 2018

2. Which domestic water types are there?

In principle, a domestic waterworks is a special niche product that is not divided into different types. However, so-called domestic water machines are relatively similar in their mode of operation. Many people do not differentiate between the terms domestic waterworks and domestic water systems, but they are grouped together in one category. In our house water comparison we explain why this is not correct where it is differences between both types of devices and what technology is recommended when and when.

2.1. Water works

Domestic waterworks have one in contrast to domestic water pressure vesselin which water is stored. Inside the pressure vessel of the domestic waterworks, the necessary pressure is built up by nitrogen or air. When the optimum pressure is reached, the pump shuts off automatically. Especially with the removal of small amounts of water has a domestic water plant has the advantage that it is due to the existing pressure vessel do not have to turn it on all the time, Only several small water withdrawals lead to the independent activation of the pump, which then restores the previous pressure. However, switch-on and switch-off pressure can cause pressure fluctuations in the entire line system.

2.2. Automatic Water

A domestic water machine, on the other hand, works like a similar one garden pump, The main difference, however, is that the machine automatically turns on when water is removed. For the garden pump, this works by activating a manual switch-on button. In contrast to the domestic waterworks, when removing water Immediately the full pressure delivered. Even if the sampling point is closed, the pump remains active for a short time to establish a back pressure before it shuts off. These Follow-up time is especially important for small water withdrawals.

2.3. What is better? Domestic waterworks or water boiler?

Whether a domestic waterworks or a domestic water machine is better suited for you depends on the use and the amount of water available. If water is only available in small quantities, a domestic waterworks is the better choice. But if z. For example, if constant pressure in the piping system is required, or if you want to remove large volumes of water at once, domestic water machines would be the better alternative.

Water works:
  • environmentally friendly
  • clearly quieter
  • lower power consumption
  • less wear
  • pressure fluctuations
  • more expensive spare parts
  • lower pressure than the machine
Automatic water works:
  • constant pressure
  • less maintenance intensive
  • no fluctuations in the system
  • higher power consumption
  • higher noise level
  • also goes for small quantities

3. Purchase criteria for domestic waterworks: You must pay attention to this

Since there are many different brands and manufacturers offering domestic waterworks, you should urgently pay attention to a few things. At Hauswasserwerk Test we have compiled the most important information for you in order to make your purchase decision easier. Where you ultimately acquire your waterworks - whether on the Internet or directly from the dealer - does not play a major role. The online purchase has the advantage of being one comprehensive selection to have. If you buy your domestic waterworks in the Bauhaus or in another hardware store, you will receive a competent purchase advice from a specialist. In addition to branded products from Gardena, Einhell, Grundfos, Metabo, TIP, Schwarzbach, Wilo or Güde you will also find no-name products and those from less well-known manufacturers.

Tip: Before you decide on a domestic waterworks model, you should always be aware of the purpose, so that the existing functions meet your needs.

3.1. How high should the pumping power be?

In general, more watts is not equivalent to a better pump. Depending on the application, the pumping capacity should therefore be adapted to your needs. The more consumers you have connected to your water system, the higher the performance should be. For a system with only one consumer should use a pump 500 watts Achieve performance. If you want to draw water for several consumers at the same time, you should pay attention to a higher wattage. at three consumers are worthwhile approx. 1,000 watts, If you have even more consumers connected, it may be like 1300 watts.

3.2. What delivery rate do I need?

Domestic Water Plant Comparison 2018: 2018

Professional domestic waterworks from Gardena.

Also, the flow rate should be an important criterion for your purchase decision. It indicates how many liters of water per hour can be transported by the pump. Here, too, ultimately decides the purpose. With a few calculations based on the table below, you can determine whether or not a domestic water system is suitable for your particular purpose. If, for example, simultaneous use of a bathtub (15 l / min), dishwasher (8 l / min), washing machine (10 l / min) and three sprinklers (3 x 10 l / min) is important, calculate the required flow rate as follows:

Add the corresponding values ​​so that 63 l / min results in our example. The required flow rate is on average 40 percent of the determined result, This means that in our case study a water requirement of 25.2 l / min could be determined. Converted to one hour (multiplied by 60), this results in a required flow rate of 1,512 l / h.

deviceLiters per minuteLiters per hour
Toilet cistern4 l / min240 l / h
dishwasher8 l / min480l / h
sink6 l / min360 l / h
shower10 l / min600 l / h
Washing machine10 l / min600 l / h
Sprinklers10 l / min600 l / h
bathtub15 l / min900 l / h

3.3. What does the max. Delivery height off?

The delivery head of a domestic waterworks says how big the difference in height between the water surface (eg garden fountain) and the water supply point may be. This means that if, for example, water is sucked in from a 7-meter-deep well and then has to be passed on 10 meters upwards, the head would be 17 meters. Around friction to take into account, this value is to be increased by 15 percent, resulting in a total of 19.55 meters. To avoid nasty surprises, you should therefore first think about which route your water must cover at least. Since most pumps have a max. Delivery head of 40-50 meters, this criterion considered isolated for you but plays a subordinate role. With private use for one's own house, only the fewest should reach the limits of the devices.

3.4. Max. Delivery pressure

The maximum delivery pressure is related to the maximum delivery height. With the medium of water, the rule of thumb is that 1 bar corresponds approximately to a head of 10 meters. If, for example, the manufacturer specifies only delivery pressure or delivery head, you can easily calculate the missing information yourself.

3.5. What does suction height mean?

In contrast to the head, the suction height does not describe the height difference between the water surface and the water tapping point, but only the difference between the domestic waterworks and the water surface of the well or cistern. At a max. Suction height of eight meters, the pump must therefore not be more than eight feet above the well. If the difference is greater than the specified max. Suction height, the pump no longer manages to suck in the water. For such a case one should if necessary about the acquisition of a Deep Well Pump think, because the max. Suction height of a house water pump at about 8-9 meters ends.

4. Questions and answers around the topic of domestic waterworks

4.1. How much is a domestic waterworks?

Domestic Water Plant Comparison 2018: comparison

Cheap domestic waterworks by T.I.P.

Cheap domestic waterworks already exists under 100 euros to acquire. On the other hand, the price is relatively open. So you can easily spend several hundred euros for more expensive copies. The price depends on many factors that you should consider before making your purchase and match with your claims. An important influencing factor is, for example, the housing material As a rule, this consists of stainless steel or plastic. Also, the origin of the product (brand name or no-name) and the associated manufacturing quality of course plays an important role. Furthermore, the efficiency of the pump but also the size of the pressure vessel influence the price. Should you If, for example, you want to store large amounts of water, you need a large boiler that has to withstand high pressure and therefore must have a good quality. The larger the boiler, the less often the pump starts, which saves energy and protects the pump. For normal household use, however, domestic waterworks with a volume of up to 24 liters are usually sufficient.

Tip: Plastic waterworks are usually cheaper than those made of stainless steel. But they are less durable, even if they can easily survive a few years without damage.

4.2. Why is my domestic waterworks not building pressure?

In order to function properly, domestic waterworks rely on a certain pressure. Only when the required pressure can be built, they are able to direct water to the required points of sale. Normally, the pre-set pressures are sufficient to guarantee smooth operation of the domestic waterworks. If, despite these default settings, the required water pressure can no longer be established, it is possible that several causes are the trigger for it. You can fix some of them yourself. But if all attempts of self-help fail, is the Consultation of a specialist recommended. In our house water test we have listed below for you the most common reasons why house water plants do not build pressure, for you:

root causeSuggested solution
loose impellerOne possible cause of your house water system not building up pressure can be a loose or misaligned impeller.To check if the problem is really related, you should open the pump. Now check if the impeller is properly seated on the axle. If this is not the case, you can follow and again properly on the Fix axle.
The pump sucks airWith a high-quality domestic waterworks this should not normally happen, as a dry-run protection should prevent this. This is not included in all equipment in the equipment. If the problem arises, there may be several reasons why you can do the following:

  • Pump tip does not hang deep enough in the water: If, for example, you are pumping water from a rainwater tank, you should stop when this problem occurs longer dry periods Check that the suction port of the pump is still in the water. If this is not the case, you can lower the pump tip.
  • The connection of the pump is leaking: In this case you should insert a new gasket.
  • A sleeve is leaking:. If a leaky sleeve has caused the problem, you would need all Check sleeves and tighten if necessary.
defective sealsBecoming with time Seals increasingly porous, which can lead to leakage of water from the pumping system. If this process increases steadily, it may be that the required water pressure can no longer be produced. The resulting frequent switching and the high workload for the pump in addition to the low water pressure also lead to faster wear. To fix this problem, you should replace defective seals. Generally one is regular controll to recommend the seals to minimize the likelihood of this problem occurring.
defective or leaking check valveThere is a possibility that the check valve is completely defective or only the seals behind or in front of the valve are affected. Again, only the help Replacement of defective parts, If you have such manual work, you can replace the parts yourself, if you are less gifted, you should hire a specialist.
Defective membraneIf none of the o. G. Causes, it is likely that a defective pressure body or a defective membrane is the trigger of the problem. In such a case, you should feel free Get a replacement, but do not do the repair yourself, but one expert left.

4.3. How do I correctly connect a domestic waterworks?

When building the house waterworks must be on a straight and solid surface. First, attach the suction line until the connection is tight. Then install the pressure line by screwing the sealing and connecting pieces into the pump outlet. Now screw the angle nipple onto the connecting nipple and fill the domestic waterworks with water after loosening the filling screw to the overflow. Finally, open the pressure line plug and connect the pump to the circuit.

More detailed information including a detailed description of the individual work steps can be found in the example video for commissioning the AL-KO HWF 1300 INOX.

4.4. Has Stiftung Warentest already tested house water works?

Domestic water works represent a niche product that has not yet been tested by Stiftung Warentest. As domestic water works but u. a. For the garden irrigation and therefore the purchase of good irrigation systems could be of interest to you, we have checked whether current tests were performed on modern irrigation systems. In fact, there is a test of historic lawn sprinklers from 1966, which from today's perspective but rather amusing than useful (05/1966 edition).

Stiftung Warentest has not yet tested any domestic waterworks and accordingly none Hauswasserwerk test winner named.

4.5. Where can I order spare parts for my domestic waterworks?

Domestic waterworks Spare parts or accessories for domestic waterworks are generally available directly from the manufacturer of the respective product. But also many DIY stores offer at least branded spare parts. In order to ensure a smooth operation, in particular components such as seals should be regularly checked and replaced.

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