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<p>As stated in the Answer of 19 June 2019 to Question 266634, test conditions are
specified in BS EN 15502-1 to ensure that the test results are repeatable and comparable.
For example section 8.1.2.5 prescribes the requirement for tests to take place under
thermal equilibrium conditions, with precautions taken to prevent thermostats or adjustable
controls or an electronic temperature control system operating and affecting the gas
rate, unless necessary for the specific test being conducted. The standard requires
these precautions, where necessary, rather than stating an absolute requirement to
disable or remove such boiler controls.</p>
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