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Water Hygiene Testing >> Industries >> Closed System Water Testing BSRIA

Closed System Water Testing for Building Services

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Ensure the longevity and efficiency of your closed heating and cooling systems with comprehensive water testing. Eurofins Water Hygiene Testing UK Ltd provides UKAS No. 9658 and 1369 accredited analysis compliant with BSRIA BG50/2021, BG29/2012, BS8552/2013 and VDI 2035, helping maintain water quality and system performance.

 

What is closed system water testing

Closed systems, including heating and cooling circuits, are susceptible to scale, corrosion and microbial growth. Regular water testing is essential to commission, monitor and control these factors, ensuring efficiency and compliance with industry standards.

 

BSRIA compliant testing services

We offer a full suite of testing services aligned to BSRIA BG50, BG29 and BS8552 include chemical and microbiological analysis.

Microbiological parameters

  • Total viable count (TVC) at 30°C; overall microbial load

  • Pseudomonas species; detects bacteria causing biofouling

  • Nitrite reducing bacteria (NRB); indicator of microbiologically influenced corrosion

  • Sulphate reducing bacteria (SRB); monitored over 5 or 21 days to assess anaerobic corrosion risk

Chemical parameters

  • pH, conductivity, alkalinity; fundamental chemistry indicators

  • Inhibitor levels (nitrite, molybdate, amines, tannin); confirm protection against corrosion

  • Corrosion and scale indicators; iron, copper, calcium, magnesium

  • Chloride, sulphate, nitrate; monitor aggressive ions causing corrosion

  • Visual appearance and odour; qualitative indicators

Why water testing matters

  • Hardness (ppm); to assess scaling risk

  • Conductivity; dissolved salts that promote corrosion

  • pH level; typically 8.2–10, adjusted if aluminium is present

  • Total dissolved oxygen; ideally very low to minimise corrosion

  • Suspended solids or particulates; indicating sludge or biofouling

Recommended testing frequency

  • Initial testing; one to three months post commissioning

  • Ongoing monitoring; quarterly, with increased frequency during the first six months if required

VDI 2035 and BS 7593

VDI 2035 (developed by the Association of German Engineers) specifies water quality guidance to minimise scale and corrosion in closed hot water systems (flow temperature ≤100 °C). It emphasises minimising chemical use by focusing on pure water and system sealing, using inhibitors only if necessary.

BS 7593:2019 provides UK guidance for system preparation, commissioning, inhibitor dosing, maintenance, cleaning and ongoing water treatment for domestic heating systems.

 

Why choose Eurofins Water Hygiene Testing UK Ltd

  • BSRIA BG50 and BG29 compliance; protocols align with the latest guidance

  • UKAS accredited laboratories; reliable and accurate results

  • Consistently fast turnaround times with robust instrumentation

  • National laboratory network; extensive drop off locations and refrigerated couriers

To tell us about your closed system testing requirements submit an enquiry or call us on +44 (0) 845 604 6740.