Get Your New Rainwater Harvesting System Commissioned by GRAF UK at No Extra Cost!

Experience 100% satisfaction, immediate results, and zero effort on your part. 

Opt for a GRAF UK rainwater harvesting, and we’ll pay for one of our engineers to come and commission your system, ensuring it is expertly installed and functioning as designed.

Perfect for homeowners and self-builders looking for a reliable, efficient, and stress-free experience. 

GRAF UK bears this expense instead of incurring additional costs typically associated with commissioning, offering you peace of mind and assurance of quality without anything extra from you.

We’ll handle everything. Simply click the button below, fill out the commissioning request form, and we’ll take care of the rest.

80% of all issues with rainwater harvesting systems are a result of incorrect installation…

Why Get Your System Commissioned?

Long-term Cost Savings

Enjoy the cost-saving benefit of free commissioning, significantly reducing the initial investment in your rainwater harvesting system.

Peace of Mind

Rest easy knowing that your system is installed correctly, backed by the expertise of our professional commissioning team.

Optimal Performance

Get the most out of your rainwater system with a setup optimised for your home. This ensures maximum efficiency and water savings.

Longevity of the System

Extend the life of your rainwater harvesting system with a professional setup that prevents common issues and promotes long-term reliability.

Enhanced Resale Value

Increase your home’s marketability with a professionally commissioned system that adds value and appeal to prospective buyers.

Environmental Impact

Contribute to environmental conservation by efficiently utilising rainwater, reducing your dependency on mains water supplies.

Get Your System Commissioned in 4 Simple Steps…

Begin your journey towards seamless rainwater harvesting in four straightforward steps:

Initiate Request

Start by clicking the button below to submit your commissioning request form online.

Acknowledgement & Guidance

You will receive an email confirming receipt of your request, accompanied by a link to the pre-commissioning checklist. Subsequently, a member of the GRAF UK team will contact you within 48 hours to explain the checklist, clarify any queries, and mutually agree upon a commissioning date.

Pre-Commissioning Preparation

Complete the checklist provided in the email, ensuring all tasks are fulfilled prior to the scheduled commissioning date.


Subject to the receipt of your completed pre-commissioning form at least 48 hours in advance, our engineer will carry out the commissioning on the agreed date.

What does a commissioning include?

Here’s what you can expect when you organise to have your system commissioned:

Join 100s of other homeowners who’ve had their

Rainwater Harvesting System Commissioned By GRAF UK

Having my system commissioned by Graf UK has given me the peace of mind I needed. No longer do I worry about my system failing and costing me a fortune!
Alan Johnson
Thanks to the commissioning service by Graf UK, they noticed the system wasn't working correctly. They managed to rectify the issue on the day of my visit.
Wendy Smith
West Yorkshire

Frequently Asked Questions

What is commissioning, and why do I need it for my rainwater harvesting system?

Commissioning is a crucial process where your rainwater harvesting system is thoroughly inspected, tested, and fine-tuned to ensure it operates efficiently and meets all regulatory requirements. It helps identify and resolve any potential issues, ensuring the system works optimally from the start.

Who will do the commissioning?

The commissioning process should be performed by qualified and experienced professionals, such as engineers or technicians, with expertise in rainwater harvesting systems. We have a team of skilled experts who will commission your rainwater harvesting system.

How long does the commissioning process take?

The duration of the commissioning process can vary depending on the complexity and size of your rainwater harvesting system. It may take 45-60 minutes to complete all the necessary checks, tests, and adjustments to ensure everything is working optimally.

Is commissioning required for all types of rainwater harvesting systems?

Yes, commissioning is essential for all rainwater harvesting systems, regardless of their size or technology. It ensures the system functions correctly, giving you peace of mind it has been installed correctly.

What can I expect during the commissioning process?

During the commissioning process, our team will comprehensively assess the rainwater harvesting system’s components, test its functions, and ensure it’s working as designed. We will also train you on the operation and maintenance of the system to ensure you can manage it effectively.

Is there any cost involved for the commissioning service?

As part of our commitment to providing exceptional service, we offer the commissioning service at no additional cost when you purchase a rainwater harvesting system from us. It’s our way of ensuring that your system is set up correctly and operates efficiently, giving you peace of mind.

How often should I schedule maintenance after commissioning?

Regular maintenance is vital to keep your rainwater harvesting system operating smoothly. After commissioning, we recommend following a maintenance schedule provided by our team. Typically, periodic inspections and servicing once a year are sufficient to maintain optimal performance.

What if there are issues after the commissioning process?

In the rare event that you encounter any issues after commissioning, don’t worry. We provide post-commissioning support and warranty to address any unexpected problems that may arise. Our team will promptly attend to the issue and make sure your sewage treatment plant operates flawlessly.