Frequently asked questions



What is Rain Water Harvesting

Please see our guide to rain water harvesting for an insight into Rainwater Harvesting. We also have an in depth training manual that can be purchased for a potential installer or enthusiast here.


Our Delivery Policy

Our delivery policy and options can be found here.


How do I know what tank size I need?

Tanks are sized according to use or yield and our tank size calculator can help you with this!

Rainwater Harvesting Tank Calculator


How long will it take to re-coupe my investment?

Our rainwater harvester calculator has a payback feature included!

Rainwater Harvesting Tank Calculator


What size downpipe does the RainCatcher filter diverter fit and can I link RainCatcher tanks together to increase the volume of water stored?

The unique and innovative, British made RainCatcher filter diverter is very versatile, fitting any down pipe up to DN100 (110mm) and can be used to filter water before it goes to a soak-away or as a filter divert to filter water before it goes to a RainCatcher water butt. When used as a filter diverter sending filtered water to RainCatcher tanks, one filter diverter can deal with a catchment area up to 85 square metres, which can fill multiple 750 or 200 litre RainCatcher tanks, therefore we would recommend you use a simple RainCatcher linking kit to help achieve maximum storage where needed.


Where Can I Find The UK Rainfall Data?

The metoffice link below will give you the rain fall in your area, this can then be used to help size your rainwater storage tank accurately:
Met office rainfall data
Please contact us for a direct link to our new RainCatcher tank size calculation tool.


How Do I Plan my Rain Water Harvesting System?

We would always recommend you speak to an experienced advisor such as RainCatcher’s highly trained staff to assist in choosing a suitable system and we are available in several guises, including live chat, email and telephone, however we have covered a few points below for your reference:


Does the tank have to be underground?

No, not at all. You should always weigh up the options open to you and design the system to suit your site and needs, this is why we offer a technical help chat and telephone line to give our customers the best service and advice possible to ensure the system choice is appropriate, compliant and user friendly.

Please see a few point to note when making this choice:

  Situating the tank below ground:

Minimal visible equipment in the garden

Suitable for smaller gardens or where space is premium.

Negligible risk of frost damage to tank


  Situating the tank above ground:

Ease of installation and lower installation costs

Easier to maintain

Risk of freezing in deep frost situations


Do I need a large roof area to provide an adequate supply of water?

No, you very rarely find a lack of roof space being an issue when weighing up yield versus use.


What does a typical rain harvesting system comprise of?

Basically – Tank, filtration and pumping equipment, these are sized according to the project. Once the main component parts have been chosen, optional extras can be added to add value where requested.


When do I need to use a filter?

A filter is recommended in every Rain Water Harvesting project, be it a small garden water butt or a large full system in order to maximise the freshness of the water and water holding period.


What is the best way to distribute water from the storage tank?


You can:

  Fill a watering can from the butt or tank

Use hose or sub terrain porous pipe

Use pump – manual hand pump or submersible electric or solar powered pump


Can Rain Water be used for Drinking?

The UK Building Regulations specify rainwater as non-potable water, however there are systems and water treatments available to bring the water up to a potable standard and if used we would highly recommend you get the water tested at regular intervals to ensure the water standard is the required quality.


Pre and After Sales Service, Maintenance, and Guarantees – What can I expect?


How long are systems guaranteed?

All component parts carry their own guarantee, however as a guide most of our water storage tanks carry a 20 year guarantee and most electrical equipment carries a statutory 2 year guarantee.


Do you have a technical support team?

Yes! We have highly trained professional team members that can offer technical support pre and post purchase. Plus we offer service and maintenance contracts if needed.


How long do orders take to arrive?

This depends on what has been ordered however we pride ourselves on our extensive stock holding and regional stock holding partners that can assist in meeting most supply deadlines.


Do You Have An Installer In My Area?

Yes – we are able to help you find an experienced / qualified installer. RainCatcher have engineers that cover almost any area of the country – please either give us a call go to our contact form in the contact us section of the web site, request a call back or just enter into a live chat with one of our experienced and knowledgeable staff.

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