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Closed System Testing

Closed System Testing | Heating System Analysis | Protect your Heating System

Closed System Testing Analysis


Regularly testing your closed heating or cooling system for microbiological and chemistry levels ensures your system is under control and is a preventative task that helps reduce risk of system failure, corrosion, scale, poor flow and bacterial growth. All of which can help reduce large bills to repair inevitable system failures if no testing is carried out. Such testing can help identify sufficient chemical inhibitor levels such as Molybdate and Nitrite. 

uRisk is a nationwide water hygiene company with City and Guilds trained engineers who have experience in industrial, commercial and domestic heating and cooling systems.

How often should I Test my Closed System?


Closed System Testing frequency is carried out every 3 months (quarterly) or when a system has changed where there is new or additional pipework.

How long does Closed System Testing take?


Closed System Testing can take up to 1 hour depending on the design and heating system you have installed.


What happens after the Closed System Testing Results


Once you receive you Closed System Testing Results you will be advised on the next steps to take. In most instances you will be advised to have your system dosed with either inhibitor and/or biocide. You may also be advised that further Closed System Testing is required to interpret how the inhibitor and/or biocide has impacted your system.

How much does Closed System Testing cost?


Closed System Testing prices may vary depending on the size, quantity of your systems and site requirements, but industry prices generally range between £100 to £400 per system test.

Microbiological Testing/Analysis

Aerobic Colony Count

Nitrite Reducing Bacteria (NRB)


Sulphite Reducing Bacteria (SRB)

Chemisty Testing/Analysis

Visual Appearance

Suspended Solids

Phosphate as PO4

Alkalinity as CaCO3 (Automated)

Iron, Ferric (Filtered)

Calcium, Dissolved

Aluminium, Dissolved


Solids, Settleable

Nitrate as NO3

Ammoniacal Nitrogen as N

Boron, Dissolved

Copper, Dissolved

Iron, Dissolved


Silicate as SiO2


Iron, Total

Boron, Dissolved

Magnesium, Dissolved

Potassium, Dissolved

Total Dissolved Solids

Nitrite as N

Sulphate as SO4

Iron, Ferrous (Filtered)

Molybdenum, Dissolved

Zinc, Dissolved

Sodium, Dissolved

How to make my Heating System or Cooling System more Efficient?


New systems are often higher more efficient systems heating systems and cooling systems due to technology upgrades. But how do we keep our heating systems and cooling systems efficient; and how do we make old and existing heating systems and cooling systems last longer?

Preventative monitoring and servicing can play an important role in avoiding large bills for faults and replacement costs for heating and cooling systems. Below are just a few ways you can avoid those unwanted expensive bills:

  • Designed correctly and fit for purpose
  • Installed correctly
  • Cleaned & commissioned correctly
  • Maintained correctly

Failure to ensure any one of these 4 items will results in poor system performance, a reduce system lifetime and more expenses.

What happens if I do not treat my Closed System?


Systems that are not treated at least annually (commercial systems bi-annually) will begin to suffer from scale, corrosion, and gassing can occur as well as the potential for microbiological proliferation. System efficiency can see up to 30-40% reduction in system efficiency on sludgy and fouled systems.

Service Process

Get a Quote

Get a quote today by phone, email, or complete our contact form to receive a quotation within 24 hours.


Our coordinator will be in touch to confirm a Date That Suits You, along with estimated time of arrival.

Your Appointment

On the day of your appointment, you will receive a 30 min Curtesy Call from an engineer to confirm they're on route.


Your report is then Quality Checked and emailed in PDF Format, with Next Day Delivery.

Support Call

Our support team will be in touch to arrange your free 30 min Support Call to help explain your report.

All payments are due prior to booking completion unless agreed in writing for 30 days from the date of invoice. We will hold your booking time for 24 hours whilst we await payment. Reports are typically next day delivery, but please allow for up to 5 working days delivery.

Your Dedicated Safety Team

water quality monitoring


Customer Service

water quality monitoring



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Legionella Control Services



Closed Water System Management FAQs

Is close water system analysis, testing, dosing required be law?

No, there are no legal requirements to undertake works on your closed system. However, if left untreated you may incur poor performance from your water systems leading to increased runnings costs. This may also lead to leaks and flooding through corrosion if not management properly.

Are uRisk qualified?

Yes, all of our assessors are fully qualified and accredited by City & Guilds legionella control association and can help assist you in meeting compliance today for HSE (ACoP L8), and provide landlords with guidance for hot and cold water low risk systems. We are also Safe Contractor and Construction Online approved so you can rest assured that you are working with a trusted water hygiene service provider who put health and safety first.

All our engineers are DBS Checked to ensure suitable people are entering your premises and to safeguard vulnerable people. We are committed to maintaining the highest standards.

Do uRisk service my area?

Yes, our services are nationwide. Whether you have one or multiple water systems and one or multiple sites, we provide services across the country, with qualified engineers scattered throughout the UK and offices based in Hertfordshire which is a 30-minute train journey to London King’s Cross. Get in contact with us and book an appointment where we can carry out a legionella risk assessment. We will look at factors like your water temperature, redundant pipework, where your water is stored and test for bacteria in water systems.

Why choose uRisk?

25 Years Experience

Over 25 years of water hygiene and legionella control experience.

Customer Service Excellence

Friendly and simple advice by phone, email & online at your convenience.

City & Guilds Qualified

All staff are trained water hygiene consultants and engineers.

Nationwide Coverage

With engineers located all across the UK, we're never too far away.

UKAS Accredited Testing

Our labs are UKAS approved providing you with quality assurance.

Full Compliance Services

Your one stop shop for Legionella control, no need to go elsewhere.

We have been working with Urisk for best part of year now. I could not recomend their services highly enough. They always promptly respond to our requests promptly and manage the job from start to finish seamlessly. I would highly recommend.
Sam Guest
Sam G.
My first time using Urisk for work at multiple sites. Daniel was absolutely brilliant, polite and professional. Highly recommended! 🙂
Claire Keay
Claire K.
Fantastic training courses and we've found the legionella risk assessment very easy to read and far more detailed than any we have previously had. 5 star service!
Gemma Pond
Gemma P.
Incredibly detailed and professional team. Have been beyond helpful with with our CQC legionella compliance for our Safety. They’ve found solutions to fit around how we work and our budgets. We are always advised with reference to HSE which has been brilliant.
Amy Thorne
Amy T.
Really easy to organise a risk assessment to be carried out at our offices and have had great help from them since to implement the necessary changes to keep the office safe. Would definitely recommend.
Holly Ferguson
Holly F.
Brilliant Service, efficient, professional, punctual and friendly.
Alex Windsor
Alex W.
We're a small GP practice and started using uRisk for legionella risk assessments. We opted to use their remedial and monitoring services and they've been absolutely great. We cannot recommend them enough! Thank you so much!
Amanda Pates
Amanda P.
Brilliant company, customer service was great! And engineers were fantastic. Thanks again uRisk! Will definitely be using them for all future work.
Nikesh Gohil
Nikesh G.
uRisk have been helping us with our Legionella Control for a number of years now. We've recently had a CQC audit and they were very impressed with our legionella compliance! Thank you for all your help.
Mike Port
Mike P.
Brilliant service! Thanks a lot for the hard graft
Leon Macauley
Leon M.
Daniel did the testing today at PGHC He was really efficient, friendly and so professional. An absolute pleasure to deal with. Thanks Daniel
Lorraine Carruthers
Lorraine C.
My experience with URisk Water Hygiene from my initial enquiry, to their site visit to undertake a Legionella Water Risk Assessment at my office (MDG), to providing me with the report and aftercare has been superb! Efficient response times, excellent customer service, friendly, helpful advisors and assessors who are always ready to help and provide guidance. An absolute pleasure to deal with, I highly recommend!
Lauren Wakeman
Lauren W.
A fabulous company, excellent customer service, they try to accommodate appoitments, and do there utmost in emergencies, been with them a few years now,  honestly cant fault them. Coming out of Covid 19, having our building urgently disanitised,  big thank-you to Luke and Lee for staying so late to get the job done!! Thank you Devon, for juggling the diary to fit us in so soon. A Team 🙂
Jo Maskell
Jo M.
Richard & Nick are great. Really good work and nice people.
Joshua Ballard
Joshua B.
This is by far the best service I have received in a long time.Lloyd who we spoke to was super helpful and very thorough with everything.I would def recommend using this company, they are not just out for money they put their customers needs first.Thank you
Coral Dawkins
Coral D.
Extremely happy with our legionella risk assessment carried out by uRisk, easy to understand and great customer service. Thanks again
Nickayla Robertson
Nickayla R.

We want to help you comply!