The 25-year warranty: what it covers and how to keep it
We set the warranty out plainly because you may need it years from now: when it starts, what it covers, what voids it, and whose name is on the certificate.
- 25 years on every tank
- From the invoice date
- Certificate in your name
- Written conditions
We reply within one working hour, Saturday to Thursday.
What the warranty covers
The factory guarantees the GRP tanks it produces for 25 years from the commercial invoice date, against manufacturing defects.
It applies to every tank type we make: underground, roof, vertical, septic and made-to-order, provided the installation guide is followed.
Mechanical fittings and accessories mounted on the tank carry a separate 6-month warranty.
Conditions that keep the warranty valid
The warranty is tied to the installation guide sent with the quotation. For buried tanks the key conditions are:
- Block-walled pit no more than 60 cm longer than the tank.
- At least 10 cm of blinding and a 10 cm clean sand bed under the tank.
- Part-backfill with clean sand, fill the tank with water, then complete the backfill.
- No more than 20 cm of backfill over the tank, and a reinforced slab at least 10 cm above it.
- For above-ground tanks: a level, even base, with nothing stored on the tank.
What voids it
The warranty covers manufacturing defects in the tank itself. We do not excavate or install, so site work is the responsibility of whoever carried it out.
- Breakage caused by backfill containing rocks.
- Breakage caused by a broken concrete slab above the tank.
- Failure to follow the installation conditions in the guide.
A certificate in your name
Each customer receives a warranty certificate in their own name, linked to their invoice. Keep the two together; the invoice date starts the warranty.
If you bought through a contractor or distributor, we issue the certificate in the site owner's name on request, so the warranty stays with you after the contractor leaves.
Frequently asked questions
Is the warranty only for buried tanks?
No. It is 25 years on every tank we make, underground, roof, vertical, septic and made-to-order, subject to the installation guide.
When does the warranty start?
On the commercial invoice date, so keep the invoice with the certificate.
Does it cover installation?
No. We do not excavate or install; the warranty covers manufacturing defects in the tank.
The tank cracked after backfilling. Is that covered?
Not if the cause was rocky backfill or a broken slab. That is why the guide comes with the quotation, so your contractor avoids those mistakes.
How do I make a claim?
Contact us with a copy of the invoice and warranty certificate, plus photos of the tank and the defect.
I bought through a contractor. Whose name is on the certificate?
We issue it in the site owner's name on request; ask the contractor or contact us directly.
Related pages
Underground installation
Pit, sand bed, backfill and slab, step by step.
Installation guidance
Our scope, your contractor's scope, and the burial conditions.
Underground water tanks
Cooler water in summer, no rust or algae, any capacity from 2,000 litres.
Quotation
A written quotation within one working hour: price, delivery and warranty.
Ready for your quote?
Send the type, capacity and city, and we reply within an hour.