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Octagon 4000l Standard Home and Garden Set
  • Octagon 4000l Standard Home and Garden Set
  • Home and garden set Standard Octagon
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Home and garden set Standard Octagon 4000l
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20,300.00 PLN 5%
19,285.00 PLN tax incl
15,678.86 PLN tax excl
The lowest price of this product in the last 30 days before the discount was 18,067.00 PLN gross
ZWDS0022
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  • Flat tank capacity from 4,000 l to 11,000 l
  • Rainwater supply to WCs, urinals, washing machines and garden outlets
  • Rainwater management system with rainwater control panel

 

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Product compliance details: Manufacturer responsible for the product

Responsibility for the Product

Octagon

Manufacturer MPI Group Sp. z o.o. Magazynowa 5 62-070 Zakrzewo Poland biuro@mpi.com.pl

MPI Group Limited Liability Company is a company that has been in business for more than 15 years, offering comprehensive solutions in the selection, sales, commissioning and service of environmental equipment, including rainwater management systems, tanks, water systems and filtration. The company combines manufacturing, integration and distribution activities, providing equipment for both individual and institutional customers - hospitals, schools, health centres, hotels. MPI's products are individually designed, tailored to the specific application.

MPI ensures that the products offered are certified to European standards and CE marked. The company has positive opinions of the Institute of Environmental Protection, NIZP (formerly PZH), has a technical approval of the Building Research Institute and a National Technical Assessment, which confirms that the equipment meets building and technical standards in force in Poland.

Home and garden set Standard Octagon

A system for rainwater management in the house and garden using a rainwater harvesting unit.

Rainwater is collected from the roof via a gutter system and fed through a drain pipe into a tank. The water is cleaned in a fine-mesh Maxi filter and then flows into the tank (by gravity). A pump pumps the water from the tank to the consumers in the building (sanitary appliances, e.g. toilet cisterns, washing machines). If the water level in the tank is too low, the sanitary facilities are automatically supplied with tap water. The house-garden system is equipped with a control unit with self-priming pump and tap water make-up control. The distance between the house and the tank can be a maximum of 12 m. This is associated with excessive suction line losses due to the large height difference between the bottom of the tank and the control panel and/or the distance between the tank and the control panel. A booster pump should then be used for the system.

Scope of delivery

Octagonrainwater tanks - Advantages

  • Permissible installation in difficult soil and water conditions (according to the rules of installation instructions)
  • Low height - shallower excavation, less earthworks
  • Flat, robust tank construction
  • Can be buried up to 1.5 m (ground level)
  • Low weight, simple installation
  • Can be loaded with road traffic when properly equipped for vehicle traffic
  • Made of monolithic pure polyethylene
  • 3 connections ø110 mm and inspection hole DN600 in each tank.
  • Dedicated place for making the spigot for the battery connection

Technical dimensions

Volume [l]
Length [mm]
Width [mm]
Housing height [mm]
Height with flange [mm]
Inspection hatch
Connections
Weight [kg]
4 000
2450
2450
1075
1375
DN 600
3x DN 110
155
7 500
4480
2450
1075
1375
DN 600
3x DN 110
305
11 000
6510
2450
1075
1375
DN 600
3x DN 110
455

Foundation conditions for the Octagon tank

  • Cycling and pedestrian traffic over the reservoir allowed, maximum ground surface up to 1.5 m. Maximum ground water level up to 1.0 m above the bottom of the reservoir.
  • Passenger vehicle traffic permitted 4.8 kN/wheel (minimum ground surface 0.6 m, maximum 1.5 m). Maximum ground water level up to 1.0 m above the tank bottom.
  • Depending on the type of load, a class B, C or D finial must be fitted to the tank. Use a relief ring, relief cone or relief plate over the tank and a matching manhole of the appropriate class.
Simple groundwater conditions (no groundwater, permeable soils)

Backfill the tank with washed gravel (8/16 mm) free of impurities. Backfill in layers of 10 cm and compact by hand.

Difficult ground conditions (presence of ground water, impermeable ground)

Backfill with 20-30 cm of lean concrete. Complete the remainder of the excavation with a layer of gravel.

For more installation details, please refer to the manufacturer's instructions in the "download" tab.

TopCover tank cover + Ascending pipe extension VS 20 + Spacer ring with 2 gaskets

Tank cover designed for pedestrian traffic. Made of double-walled polyethylene with child protection. The VS 20 ascending pipe extension is 235 mm high, Ø 600 mm. The ring is 600 mm high and is adjustable (telescopic).
Maxi filter with extension
Filter basket with ascending pipe (extension pipe) attached to the filter (Dimensions: Ø 350 mm, height 570 mm. Can be shortened at will). The rainwater filter basket is equipped with a convenient handle for pulling the basket out. It is excellent for use in gardens, ponds and drainage systems. The rainwater filter ensures thorough cleaning thanks to its 0.9 mm mesh size and is therefore also suitable for domestic systems. It is installed directly in the ground in front of a tank or rainwater infiltration system. Advantages include : Narrow design, simple installation, small cover. Inlet and outlet DN100. Housing and cover made of rigid PE. There is an option for expansion (using an ascending pipe). Optional cover to allow vehicular traffic. Recommended for roof areas of up to 350 m².

Floating water intake

Thanks to the float, the intake always floats approx. 15-20 cm below the water surface, from where the cleanest water can be pumped from the tank (various types of debris can float on the water surface). A mesh filter provides additional protection against impurities. Elements of the set: float with a diameter of 15 cm, mesh filter - mesh 1.2 mm, non-return valve 1``, ferrule 1`` with o-ring for suction hose Ø 36 mm, suction hose Ø 36 mm and length 2 m.

House filter for 1`" water after the rainwater control unit

Narur filter with a diameter of 1`` for cleaning rainwater from micro-pollutants.

PressureWave GWS 35LV diaphragm tank
High-quality 35 litre pressure vessel from the PressureWave range. The PressureWave diaphragm vessel is designed for: booster systems, systems subject to thermal expansion, irrigation and hydraulic shock attenuation. The robust construction and innovative technological solutions ensure a long service life. A top quality product. The diaphragm tank maintains constant water pressure in the system. Limits too frequent pump start-ups.

Rainwater central unit:

The unit pumps rainwater from the tank and delivers it to the indoor installation. If there is no rainwater in the tank, the central unit allows the automatic use of tap water. There are three main components in one unit: pump, control and tap water make-up system. The central unit should be installed inside the house, e.g. in the basement, boiler room or utility room. For more information on the parameters of the C Plus rainwater control units, please see the download tab.

Technical data
AquaMatic Domestic C Plus air handling unit
Max. capacity
4.8m3/h
Max. pressure
5.2 bar
Max. distance to consumer
15 m
Max. suction depth
8 m
Protection class
IP 41
Rated power
880 W
Supply voltage
230 V
Suction line connection
1`` (GW)
Connection of discharge pipeline
1`` (GW)
Water supply connection
¾` (FG)
Emergency overflow
Pipe ᴓ 75 mm
Float switch
20 m (without grounding)
Dimensions (W x H x D)
500 × 650 × 240 mm
Weight
30 kg
Housing
YES
Additional functionality
Possibility to connect a booster pump to extend the distance between the unit and the rainwater tank*.

* This involves suction line losses due to excessive height difference between the bottom of the tank and the unit and/or the distance between the tank and the unit.

This short guide will help you choose the right capacity for your underground rainwater storage tank - without difficult formulas. We will show you how to estimate your needs, count the amount of water from your roof, select the capacity and plan a simple garden installation.

Step 1: Determine what you will use the rainwater for.

List the uses: watering the garden, flushing toilets, laundry, washing the car, housework. This will allow you to estimate the real need for water in a typical week.

  • Garden watering - take a guideline of 20-25 l/m² per month per season.
  • Toilet flushing - approximately 35-50 l/person/day.
  • Laundry - approx. 15-20 l/person/day.
It is advisable to select a tank for 2-3 weeks of typical use - in practice there is no point in storing 'for the whole year'.

Step 2: How much water you collect from the roof (no complicated formulas)



In simple terms, assume: annual rainfall × roof area × runoff coefficient. For most roofs, you can assume a coefficient of around 0.9 (depending on the roofing and the layout of the gutters).


Brief example: calculation of possible rainwater yield

Roof 120 m², annual rainfall ~600mm (approx. 600 l/m²). Estimate: 120 × 600 × 0.8 ≈ 57,600 l/year. This figure helps to select the capacity for a period without rain. And a period without rain can last for 3 weeks. Therefore, you must divide the result by 21 days. That is: (57600 l /365 days)*21 days = 3314 l, the result according to the estimation should be taken as a minimum. Therefore then we choose 4000l , 5000l, 6000l tanks - because of how we will use the rainwater.

Step 3: Selecting the tank capacity

It is most practical to select a tank that will store a supply of water for 2-3 weeks of your needs.

Schemat obliczania pojemności zbiornika na deszczówkę – opad roczny × powierzchnia dachu × współczynnik spływu
How to calculate capacity: annual rainfall × roof area × runoff coefficient ≈ annual amount of rainwater to be collected.

  • 2000-3000 l - small garden, 1-2 people.
  • 4000-6000 l - family of 3-4 people + garden 200-300 m².
  • 8000-10 000 l - larger garden, intensive watering. 300 m² - more , and with automatic watering.
But you will do this more precisely using the selection calculator below:

If you prefer, open the calculator in a new tab: Tank selection calculator. If you have any problems, please contact our customer service.

Step 4: Tank selection - material

In detached houses, underground rainwater tanks are the best choice - they do not take up space in the garden, provide stable temperatures, no water freezing and allow larger capacities without affecting aesthetics.

The best material is PE, HDPE, MDPE plastic - it is lightweight, corrosion resistant, easier to install and above all airtight for many years .
It is worth paying attention to water and ground conditions. If the ground water level is high or the soil is clayey, flat tanks such as the F line, Bolt, Eco line Slim, etc., are the best choice.
On the other hand, if the conditions are normal, any solution can be used. If you have any problems, please contact our customer service.

Step 5: Simple installation in the garden

The simplest arrangement: gully filter in front of the tank or basket filter, underground tank, floating intake, automatic pump and point of use (tap). This makes watering convenient and economical.


Podlewanie ogrodu deszczówką ze zbiornika podziemnego – przykład zastosowania w domu jednorodzinnym

Summary:

  • Estimate the weekly consumption (garden + house).
  • Calculate the roof potential (rainfall × area × ~0.9) and divide by 365 days and multiply by 21 days ( 2-3 weeks of drought).
  • Select an underground storage tank taking into account the yield (calculated from the roof area) and contrast it with the consumption e.g.: water in the garden. Select capacity
  • Add a filter, pump and collection point, or choose an off-the-shelf solution: Rainwater systems for the garden

FAQ: How to choose a rainwater storage tank

What capacity to start with?

For example: family of 3-4 people + garden of 80-150 m² → 4000-6000 l usually works well. Larger garden / intensive watering → 8000-10 000 l. Verify with the calculator above.

Is it possible to supply toilets with rainwater?

Yes - using a suitable system (rainwater control unit/automatic switchover) and filtration.

What about excess water?

Plan an overflow to an infiltration or rainwater drain in accordance with local regulations.

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