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1: What is a heat meter used for?

To measure in kw/hr the energy used to heat water. This can be used for monitoring or billing purposes.

2: What are the applications?

They are used for heat exchangers, heating systems, billing, district heating, chilled water and general HVAC applications.



3: How are they typically installed?

The small in line units are fitted in the return flow. For flow rates above 2.5m3/hr a water meter and heat meter are used to gather. Here is a typical installation


4: What parts do I need?

This depends upon pipe size and flow rates. The most economical solution for flow rates up to 2.5m3/hr is to use the all in one in line compact heat meters.

For larger sizes use a multi jet or Woltmann hot water meter (or a cold meter for chilled water applications) in conjunction with a wall mounted heat meter. Also, 2 temperature pockets must be used, one for flow and the other for return. The 85mm version size pocket is preferred for all pipe sizes. The water meter should be fitted in the return flow and the pulsed output connects into the heat meter to give the flow information.

5: I need a BMS output

All heat meters have a choice at the time of ordering of a pulsed output in kw/hr or an Mbus output. All Delta Flowtech meters are fitted with one or the other as standard. This must be specified at the time of ordering.

6: How do I size the meter?

Pipe size does not always accurately reflect the correct meter to choose, flow rate is more important. The in line units are up to 2.5m3/hr. The larger sizes must also be checked so that the water meter chosen must be between the transitional and nominal flow rates.

7: What are the pockets for?

Pockets are fittings that are screwed into the pipe so that the temperature sensors can be inserted to accurately measure the temperature in the centre of the pipe.

8: How long is the battery life?

The Compact in line meters are battery only. The wall mounted units have a choice of battery or 230vac, most people choosing the battery version. Life is at least 6 years and no data is lost upon changing the battery. A standard 3v lithium battery is used.

9: Heat meters are known by other names too.

Some customers may ask for a heat integrator, BTU meter, energy meter or a heat meter. All are the same device.

10: Mbus and Modbus -are they the same.

No they are not. The heat meter are in Mbus, not Modbus. They are 2 different communication types and cannot be mixed together. Modbus is not an option for the heat meters.