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Water tests in 5 buildings

Iron in the water of heating or cooling pipes, before and after: 91–99% lower in all five buildings. Each result shows its source and its own notes.

Results in the U.S. (Washington, DC)

Embassy of Japan (Washington, DC)

30+ years old · heating hot-water loop

98%lower

Iron in the water, mg/L

6.2 → 0.1 mg/L (after 3 weeks)

Sampled by the maker. Tested by a lab in Japan.*5

Residence of the Ambassador of Japan (Washington, DC)

40+ years old · heating hot-water loop

91%lower

Iron in the water, mg/L

2.3 → 0.2 mg/L (after 3 weeks)

Sampled by the maker. Tested by a lab in Japan.*5

Chilled-water and heating mains in London

Holiday Inn London Heathrow

Chilled-water main

99%lower

Iron in the water, mg/L

0.669 → <0.007 mg/L (after 19 weeks)

Case data from the maker.*5

Royal Bank of Scotland, 250 Bishopsgate (London)

Closed-loop heating (low-temperature hot water)*5

97%lower

Iron in the water, mg/L

1.1 → 0.03 mg/L (after 1 year)

Open the RBS 250 Bishopsgate case report (5 pages)

Case report (5 pages)Prepared by Japan System Planning Co., Ltd. · 2019 · Low-temperature hot water (closed loop)*13

British Museum (London)

Heating main

99%lower

Iron in the water, mg/L

20 → 0.2 mg/L (after 5 weeks)

Before and after taken at different points and tested by different labs.*5

Open the British Museum case report (3 pages)

Case report (3 pages)Prepared by Japan System Planning Co., Ltd. · 2016 · Heating main*13

Facility statements, case reports and press

Tap any document to read every page.*13

In print

The Royal Garden Hotel and Guildhall statements and the Whittington Hospital report are from domestic hot water systems. Round 1 starts with heating hot-water loops.

Building and organization names identify where units were installed. Their mention does not mean those organizations endorse NMR Pipetector or Tengcle; quoted statements are the views of individual staff at the time.

Your trial runs the same test in your own building: iron in the loop water, before and after installation, under the same conditions. You buy only if it drops to half or less within 3 months.

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Notes

  1. *1Data: Japan System Planning Co., Ltd.
  2. *2As of 2025. Data: Japan System Planning Co., Ltd.
  3. *3Typical time on a standard site.
  4. *4Mechanism as described by Japan System Planning Co., Ltd.
  5. *5Data: Japan System Planning Co., Ltd. Laboratory analysis of loop water sampled at each facility before and after installation. Washington, DC (installed in 2018 by engineers from Japan): sampled by the maker, measured by a laboratory in Japan. British Museum: pre-installation sample taken in February 2016; before and after samples taken at different points and tested by different laboratories. Results vary by building and system.
  6. *6The scope of the warranty is set by contract, including how it applies to loops above 70°C (158°F). Patents: Japan (2007), United States (2009).
  7. *7Trial terms are set out in a signed trial agreement for each building.
  8. *8Data: Japan System Planning Co., Ltd.
  9. *9"A New Era for Museum Sustainability," Papyrus Vol. 26, No. 1 (March 2025), the journal of IAMFA (International Association of Museum Facility Administrators). Contributed by Japan System Planning Co., Ltd.
  10. *10Quoted from a statement dated November 7, 2014, by the Guildhall Technical Services Manager at the time, City Surveyors Department, City of London. An individual result on the West Wing domestic hot water system (installed July 2013).
  11. *11Report by Japan System Planning Co., Ltd. on the hospital's domestic hot water system (installed May 2006), with the laboratory certificates. An individual result.
  12. *12Quoted from a statement dated October 31, 2014, by the Technical Service Manager at the time, Royal Garden Hotel Kensington London. An individual result on the domestic hot water system. It is not a promise of the same results or costs.
  13. *13Document images courtesy of Japan System Planning Co., Ltd. Personal contact details, signatures and some logos have been obscured.
  14. *14Quoted from a statement dated August 7, 2019, by a manager at the time in Electrical and Critical Environment Management, Property Services, RBS. The "independently tested results" the statement mentions are water analyses by Chemtest, commissioned by Japan System Planning Co. (UK). An individual result on the low-temperature hot water (closed-loop heating) system installed in March 2018.
  15. *15The listing is the publication's own and is not a guarantee of results.
  16. *16Japan System Planning Co., Ltd. list price, March 2025. Per unit, FOB Tokyo, excluding tax.
  17. *Photos and diagrams are illustrations. In a real system, the pipes are completely full of water.

Building and organization names identify where units were installed; they do not mean those organizations endorse NMR Pipetector or Tengcle.