BS EN 1264-2-2021 PDF

Full title and description

BS EN 1264-2:2021 — Water based surface embedded heating and cooling systems — Part 2: Floor heating: Methods for the determination of the thermal output using calculations and experimental tests. This document specifies the boundary conditions, calculation procedures and experimental test methods used to determine the specific thermal output (heat emission) of water‑based floor heating systems.

Abstract

EN 1264-2:2021 defines two complementary approaches to determine the thermal output of hot‑water floor heating systems: a calculation method (for systems that meet the types defined in EN 1264‑1) and a measurement/test method (for systems not covered by the calculation model). It specifies thermal boundary conditions, required test arrangements and the format of results (standard specific thermal output, characteristic curves and associated temperature differences).

General information

• Status: Published (European standard adopted as a national standard; published as BS EN 1264-2:2021).
• Publication date: 28 May 2021 (BS adoption/publication date; CEN approval and May 2021 publication as EN 1264-2:2021).
• Publisher: British Standards Institution (BSI) — adoption of the CEN document EN 1264-2:2021.
• ICS / categories: 91.140.10 — Central heating systems / heating appliances without integral heat sources.
• Edition / version: 2021 (BS EN 1264-2:2021, superseding earlier editions).
• Number of pages: 44 pages (BS/printed edition; some national publications list 41–44 pages depending on front matter).

Scope

Applies to water‑based surface‑embedded floor heating systems installed in residential and non‑residential buildings for thermal comfort. The standard covers methods to determine the specific thermal output as a function of the temperature difference between the heating medium and room temperature, giving the conditions, calculation rules and test procedures to produce characteristic curves, standard specific thermal output and associated temperature differences. It is intended to be used for systems defined in EN 1264‑1 (types A, B, C, D, H, I and J); systems not matching those types may be evaluated using the measurement method described.

Key topics and requirements

• Definition of thermal boundary conditions for testing and calculation (temperatures, reference conditions, downward heat loss considerations).
• Calculation method for specific thermal output (characteristic curves and limit curves) for system types covered by EN 1264‑1.
• Measurement/test method and test report requirements for systems that cannot be calculated per Clause 6.
• Assessment of influence of pipe location, pipe material, screed and surface layers on emitted heat and thermal conductivity data.
• Calculation of system thermal capacity (C‑value), verification of test equipment, master sample procedures and software verification for test calculations.
• Form and presentation of results: standard specific thermal output, associated standard temperature difference, fields of characteristic curves and limit values.

Typical use and users

Used by product manufacturers, test laboratories, certification bodies, consulting engineers, HVAC designers, installers and specifiers to determine and document the thermal output of underfloor heating products and systems; it supports type testing, product datasheets, performance declarations and national adoption/certification schemes. Regulatory bodies and certification schemes that reference EN 1264 series rely on these methods for harmonised test and calculation results.

Related standards

This part is one of the EN 1264 series; related documents include EN 1264‑1 (definitions and symbols), EN 1264‑3 (dimensioning), EN 1264‑4 (installation) and EN 1264‑5 (determination of thermal output for wall and ceiling heating and for cooling). National adoptions (BS EN 1264‑2:2021 and other national versions) and committee work by CEN/TC 130 provide the technical context.

Keywords

underfloor heating; floor heating; surface‑embedded heating; water‑based systems; thermal output; test methods; calculation methods; characteristic curve; C‑value; thermal conductivity; EN 1264.

FAQ

Q: What is this standard?

A: BS EN 1264-2:2021 is the British adoption of the European standard EN 1264-2:2021 that specifies methods (calculation and experimental tests) to determine the thermal output of water‑based floor heating systems.

Q: What does it cover?

A: It covers thermal boundary conditions, calculation procedures for specific system types, measurement/test procedures for non‑calculable systems, presentation of results (standard specific thermal output and characteristic curves), and related test/reporting requirements.

Q: Who typically uses it?

A: Manufacturers, test laboratories, certification bodies, consulting engineers, HVAC designers, installers and standards/technical committees use it for product testing, performance declaration, system design validation and national implementation.

Q: Is it current or superseded?

A: EN 1264-2:2021 is the current edition published in 2021 and it supersedes EN 1264-2:2008+A1:2012. National adoptions (e.g., BS EN 1264-2:2021) were published in 2021. Users should verify national status and the latest amendments or corrigenda before relying on it for compliance.

Q: Is it part of a series?

A: Yes — it is Part 2 of the EN 1264 series (Parts 1–5) covering water‑based surface‑embedded heating and cooling systems; the other parts cover definitions (Part 1), dimensioning (Part 3), installation (Part 4) and thermal output for walls/ceilings and cooling (Part 5).

Q: What are the key keywords?

A: Underfloor heating; floor heating; water‑based surface systems; thermal output; test methods; calculation; characteristic curve; C‑value; thermal conductivity.