Heat meter Santech QHeat5 QH51-000-00-0 qp 1.5 m³/h DN15 return

Santech QHeat5 QH51-000-00-0 qp 1.5 m³/h DN15 return is a heat meter engineered for return-line measurement in heating systems. It combines a volumetric flow sensor with temperature-difference sensing to calculate thermal energy consumption. The device is designed for compact DN15 installation and supports a nominal flow rate of 1.5 m³/h, making it suitable for residential and light-commercial heating circuits that require return-side metering and mid-range flow capacity.

Advantages

The meter provides integrated flow and temperature measurement for accurate energy calculation while occupying minimal space thanks to its DN15 form factor. Designed for return-line installation, it enables direct measurement of returning heating medium and reduces potential installation complexity where return-side access is preferred. Its mid-range nominal flow supports a range of common household and small business heating loads, and the construction materials and sensor placement are intended to deliver stable readings over typical operating conditions.

Suitable for

• Residential central heating systems with return-line metering
• Small apartment buildings and multi-dwelling units with DN15 piping
• Light-commercial premises with moderate heat demand
• Replacement or retrofit projects that require compact DN15 meters

Key specifications

• Nominal flow (qp): 1.5 m³/h
• Connection size: DN15
• Measurement type: return-line heat metering (flow + temperature differential)
• Application: residential and light-commercial heating systems
• Physical form factor: compact inline meter for DN15 piping

How to use

Install the heat meter in the return pipe of the heating circuit in the orientation recommended by the manufacturer, ensuring proper sealing and alignment with DN15 fittings. Connect temperature sensors and flow connections according to system wiring and hydraulic diagrams, taking care to maintain correct thermal contact and avoid air pockets in the sensor region. After mechanical and electrical installation, configure the meter parameters following technical documentation, verify measured flow and temperature readings, and perform commissioning to confirm accurate energy calculation across expected operating ranges.

Usage recommendations

Ensure regular inspection for leaks, clean sensor surfaces if accessible, and follow scheduled verification procedures to maintain measurement accuracy. When replacing an existing meter, confirm compatibility with existing DN15 fittings and controller interfaces to minimise downtime.