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Rainwater harvesting system Underground Rain 3000l
  • Rainwater harvesting system Underground Rain 3000l
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Underground rainwater harvesting system 3000l
5/5 z 1 recenzji produktu Write a review Write a review
3,890.66 PLN 5%
3,696.13 PLN tax incl
3,004.98 PLN tax excl
The price has not changed
Capacity:
Water intake:
Delivery individual valuation
Delivery time 3-7 days
Ask about the product
  • Capacities 3000l - 8000l
  • Basket filter, automatic pump and water intake box
  • Complete rainwater utilisation system

 

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Product compliance details: Manufacturer responsible for the product

Responsibility for the Product

UHPlast

Manufacturer Uhplast Sp. z o.o. Ołowiana 11 85-461 Bydgoszcz Poland sales@uhplast.pl

Uhplast is an experienced manufacturer of plastic products, specialising in the rotational moulding method. The company has been in business for over 17 years, serving domestic and international customers (working with partners in 27 countries). Products include:

  • rainwater and drinking water tanks (various types: horizontal, vertical, underground, rectangular, flat)
  • faecal and underground tanks
  • engineering, handicraft and special products tailored to individual orders
  • spare parts and components for machinery - also as an alternative to metal parts

The company develops and produces new products from polyethylene, also in smaller series, with a focus on quality and reliability. Uhplast products are used in households as well as in industry or engineering installations.

Uhplast products are certified by the PZH (Polish National Institute of Hygiene) as safe for contact with water and meet the requirements of current quality standards.

Underground rainwater garden system 3000l - 8000l

A complete system for the use of rainwater in the garden with capacities of 3000l - 8000l

The Underground tanks are characterised by their high durability and resistance to external conditions. The tank is buried in the ground and the only visible element on the ground is the cover installed on the inspection manhole. The Underground UHPrainwater tank is distinguished by its low profile. This allows installation in areas with high groundwater levels, reducing excavation and transport costs. Reinforced with three stiffening rings, top ribs and four internal support pipes, it can withstand external pressures of up to 1.3 t/m².

The UndergroundRainwater Tank by UHPlast is made of polyethylene, using the rotational moulding method, which guarantees its durability and strength. However, it must be remembered that the tank should be properly sited. The subsequent steps of its assembly must be carried out in the correct order. Assembly instructions can be found in the download section.

The tank is guaranteed for 3 years.

The tank is equipped with: stiffening pipes 4 pc., ferrules Ø110x500 2 pcs., ferrule Ø110 1 pc., sealant, rubber gaskets 2 pcs. 110 and 2 small (for pressure pipe, pump and cable), strainer, stainless steel screws 4 pcs. - everything for connecting the tank, including tight insertion of pipes and cables. All this allows for a fast, tight and problem-free installation. Thanks to the adjustable superstructure (20-81 cm), the underground rainwater tank adapts to the site conditions. A large allen-screw cover protects against unauthorised access and a basket-filter provides pre-filtration of debris protecting the pump from damage. The product is ISO 9001 and PZH certified, confirming its safety and quality.

Technical data of the Underground rainwater storage tank

Capacity [l]
Tank height [cm]
Height of over-tank - adjustable [cm]
Diameter [cm]
Manhole diameter [cm]
Wall thickness [mm]
3000
93
from 20 to 81
230
62
8,5
5000
143
8000
219
11

Water intake:

External intake - garden box for garden hose connection. Included is a ¾ GZ ball valve and a ¾"-1" GZ PE elbow screwed into the ball valve from below. Top diameter of the box - 210 mm, bottom diameter of the box - 180 mm, height of the box - 120 mm.

Delivery hose to connect the pump to the garden box

3.2 metre discharge hose to connect the pump to the water intake - strength up to 5 atmospheres for the garden box.

The hose is 3 m long when integrated into the intake cover. It is terminated with a quick-release coupling and threaded connection.

Multi IP 1000 Auto submersible pump
Submersible pump Lift 45 Auto
Submersible pump Lift 35 Auto
High-performance submersible, pressure pump. Ideally suited for garden irrigation or sanitary purposes. Integrated pressure switch with flow sensor automatically switches the pump on/off as required. The integrated "dry run" protection protects the pump from damage by stopping operation if the water level is too low. The pump is equipped with a carrying handle and power cable. Adapted for use with a flexible hose.
Automatic submersible pump that requires no additional accessories. Integrated pressure switch with flow sensor automatically switches the pump on/off as required. The integrated dry-running protection protects the pump from damage by stopping operation if the water level is too low. The pump is equipped with a convenient carrying handle and power cable. Adapted for use with a flexible discharge hose.

Depending on availability, the set is supplied with a Multi IP 1000 Auto pump, a Lift 45 Auto pump or a Lift 35 Auto pump. All of these pumps are of high quality and are successful replacements.

Pump specifications:

Pump modelQmax
Capacity
[l/min]		Hmax
Head
[m]		P
Motor power
[kW]		U Voltage
[V]		Discharge outlet
[Inch]		H
Height of pump
[mm]		A
Pump diameter
[mm].		Cable length
[m]
Multi IP 1000 Auto100401,002301 1/2 "53017010
Lift 35 Auto100350,801 "48014510
Lift 45 Auto100401,0053514510

NOTE: When ordered, the set is delivered in 2-3 parts.

Specific References

ean13
5905943321753

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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2025-09-30

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Recommended to buy: Yes

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