
16,000 Litre Rainbox Combi Rainwater Harvesting System
What is Rainwater Harvesting?
Rainwater is collected from your roof area; it is then passed through a filter system which removes any large pieces of debris, leaves, etc. and then into the underground storage tank via a calmed inlet which is designed to stop the disturbance of any sediment in the bottom of the tank. Excess rainwater will pass through a siphoned overflow fitted to the tank to be connected to the storm drain or soak away.
Why Harvest Rainwater?
- Rising utility bills, reduction of running costs and environmental implications are just three reasons for investing in a rainwater harvesting system. Up to 80% of commercial main water can be replaced by rainwater harvesting
- Rainwater harvesting is a key component to reach compliance within the code for sustainable homes to reduce overall water consumption.
- Additionally, rainwater re-use scores highly with the Water Efficiency sector of the BREEAM accreditation scheme and can help gain planning permission by meeting site drainage requirements (ref. Building Regulations Part H) as part of a sustainable drainage (SUDS) scheme.
What's included in the system?
- Underground Storage Tank 16000L
- Internal Filter System max roof area 2000m2
- 2 x Pedestrian rated covers 1 x 600x600 1 x 750x750
- Submersible water pump with built-in pressure switch and dry run protection
- 500L GRP Header Tank c/w AB air gap and 2 inlet valves
How does the Rainbox Combi Work?
Not only is the Rainbox Combi environmentally friendly, it has the added benefit of lowering utility costs for the end user by replacing up to 80% of commercially available mains supplied water with collected rain water.
The collected Rainwater is pumped or gravity fed to a low level break tank. In turn, the water is then gravity fed to an integral or external booster pump system for onward distribution to the serviced appliances.

Features
- Bluetooth Inverter
- 12L Expansion Vessel
- AB CAT5 Air gap to stop cross contamination
- Whisper Quite, WRAS approved submersible pump
- 500 mm Invert depth
Please note all RWH tanks have 2 access turrets 600mmx 500mmhigh
Delivery
All our Rainwater harvesting tanks are for delivery by customer offload. This entails the customer to acquire the right manpower and/or machinery to help unload the tank/s from the delivery vehicle.
If you require assistance with offloading, we may be able to offer a tail lift (lowers the tank to the ground) or HIAB (lorry with a mounted crane to winch the tank off the delivery vehicle). Please contact us if this is required for delivery.
| Diameter | Ø 1850 mm |
|---|---|
| Tank Use | Below Ground |
| Application | Rainwater harvesting |
| Category | Underground |
Important — please read
Please ensure the product you are ordering is the correct size and suitable for the purpose. Special order, bespoke and non-stock tanks are not returnable. If you order a tank and find it is too big, too small, or unsuitable for your requirements, it can be expensive to return. Our cancellation & returns policy explains this in more detail — see Terms & Conditions.
Delivery charges
Our shipping costs cover most of the UK. However, parts of England, the Scottish Highlands and Islands (including areas north of the Glasgow / Edinburgh border), Isle of Wight, Channel Islands, Isle of Man, Anglesey, Western Isles, Shetland Islands, Orkney Islands, Isles of Scilly, Northern Ireland and the Republic of Ireland may cost more.
Please call before ordering if the delivery postcode is listed below. There may be additional shipping costs.
- AB
- BT
- CA
- CT
- DD
- DG
- EH
- FK
- G
- GY
- IM
- IV
- JE
- KA
- KW
- KY
- LD
- LL
- ML
- PA
- PH
- PO 30–41 Isle of Wight
- SA
- SY
- TD
- TN
- TR
- ZE
- Southern Ireland
Looking to avoid shipping charges?
All our tanks are available for collection ex works. Our suppliers are based all over the UK — please call if you wish to collect.
Overseas orders
International orders are welcome. Payment is by IBAN / SWIFT / BIC, MoneyGram and letters of credit. We regret that credit cards are not accepted for international orders.
A purchase order is required; we will then create a pro-forma invoice, and tanks are ordered on clearance of funds.
If you require additional export documentation — for example a Certificate of Origin, or commercial invoices certified by the Chamber of Commerce — you must notify us before completion of your order, as we will have to invoice cost and admin charges to the order.
Please call if you have any questions: +44 (0)1643 703358
Offloading
Unless a HIAB delivery has been booked at additional cost, it is the customer’s responsibility to offload with suitable equipment on the day of delivery. A failed delivery may result in additional charges.
We recommend that installers, plant hire and installation materials — excavators, aggregates and so on — are not booked until you are in receipt of the goods. Tanks Direct cannot be held responsible for costs incurred due to unforeseen delays; please see our terms for more details.
Any questions about your delivery? Contact the Sales Team on 01643 703358.
Looking to return an item?
If you wish to return goods, please complete the form on this page to provide further information.
Once your request is approved, a valid Returns Authorisation Number (RAN) will be issued to initiate the returns process along with information on how & where to return your order along with any costs involved.
Please DO NOT return any goods without this authorisation. Goods cannot be accepted without this.
Returns are not accepted at our Minehead Office, please wait until we contact you before returning any goods.
Please click here to request a return of one of our products.
Talk to a
specialist
Sizing, regulations, installation. Our team has been answering these questions for over 25 years.
Why Tanks-Direct
22 years. 100,000+ tanks. Specialists, not generalists.
Nationwide delivery
GB and Northern Ireland covered. HIAB and crane offload available. Highlands and Islands quoted on request.
WRAS & BS EN compliant
Every potable tank is independently certified. Documentation supplied with each delivery.
Best-price guarantee
4.6/5 on Feefo from 1272 verified reviews. We price-match any genuine like-for-like quote.
Specialist advice
Trade-grade phone and email support, Mon-Fri 8am-5pm. Site visits for orders over £2,500.




