What is the maximum temperature this meter can handle?

90°C, as specified in the scope (Clause 1).

What is the standard accuracy of these hot water meters?

The maximum permissible error is ±2% for the upper flow range (Qt to Qmax) and ±5% for the lower flow range (Qmin to Qt), as per Table 2.

What is the maximum working pressure for these meters?

The maximum admissible working pressure is 1.6 MPa (Clause 5.4).

What are the standard connection types for these meters?

The meters are specified with screwed end connections having threads conforming to IS 554 (Clause 6.3).

IS 13959

: 1994

Water Meters for Hot Water - Specification

CurrentSpecializedSpecificationBIMMEP · Plumbing Fixtures and Valves

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This standard specifies the requirements for materials, construction, performance, and testing of inferential (turbine) type water meters for metering hot water. It covers meters from 15 mm to 50 mm in size, designed to operate with water temperatures up to 90°C and a maximum working pressure of 1.6 MPa.

Specifies requirements for water meters intended for measuring the volume of hot water.

Quick Reference Values

Maximum admissible temperature90 °C

Maximum admissible working pressure1.6 MPa

Maximum permissible error (Qt to Qmax)± 2%

Maximum permissible error (Qmin to Qt)± 5%

Nominal Sizes (DN) covered15 mm to 50 mm

Pressure loss at Qmax≤ 0.1 MPa

Practical Notes

Ensure that a strainer is installed upstream of the meter to prevent debris from damaging the internal turbine mechanism.

These meters must be installed in the correct orientation as indicated by the flow arrow on the body; incorrect installation severely affects accuracy.

Do not use a standard cold water meter (IS 779) for hot water applications, as their internal components are not designed for high temperatures and will lead to premature failure and inaccuracy.