Level 3 Heat Pump Monitoring Bundle (emonHP)

£619.37 (Inc. VAT)
£516.14 (Ex. VAT)
2,000.00 Grams
Current Stock:
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Pre-provisioned fully inclusive bundle for Level 3 Heat Pump Monitoring.

The bundle includes everything required for high accuracy (1-2% MID approved) monitoring of all air-to-water air source heat pump (ASHP) or water-to-water ground source heat pump (GSHP).

The monitoring system is web-connected with remote data access available via emoncms.org, see example:

Emoncms Heat Pump Dashboard Example


The bundle includes fully pre-provisioned hardware ready to install on-site, remote web-connected data access and 1:1 installation telephone support. 

Ideally the monitoring hardware should be installed during the installation of the heat pump by a competent installer. Retrofitting may be possible, but installation of the heat meter will require draining down the system. 

Due to the pre-provisioning required for this bundle please allow 10-15 working days for shipping.

Bundle Includes

  • MID approved Electricity Meter(s) (SDM120)
  • MID approved Heat Meter (please choose option....) 
  • emonHP datalogger WiFi & Ethernet connectivity  
  • USB Modbus RS485 reader (for electricity meter(s))
  • USB M-Bus reader (for heat meter)
  • DIN mount metal enclosure for electricity meter
  • Power supply and cables
  • 10yrs of free emoncms.org data logging 


  • 2 x 28mm compression fittings for heat meter: (3/4" BSP to 28mm straight coupler)

  • 1 x 28mm compression temperature sensor pocket (Female Branch Tee 28mm x28mm x 1/2")

User Manual 

emonP Heat Pump Bundle Setup and user Guide (pdf)


Choice of Heat Meter 

A heat meter calculates the heat energy delivered by the heat pump by measuring the flow rate and flow/return temperatures. A heat meter is essential for accurate COP measurement. 

All heat meters induce some degree of pressure drop which results in slightly increased pumping power. Larger heat meters have lower pressure drop, but are considerably more expensive. We have tried to recommend heat meters for various heat pump sizes, balancing pressure drop vs cost of the meter. Please do your own calculations to ensure the heat meter is suitable for your application. There is no harm in using a larger heat meter on a smaller heat pump, this will result in lower pressure drop. 

Our recommended heat meters have a maximum pressure drop of 0.5m, which is approximately equated to 4.5W of additional pumping power on an open-loop system. If using hydraulic separation (buffer or LLH) and multiple pumps then the increase in power will be significantly less. See below for a breakdown of pressure drops for each meter:

See our detailed guide to Choosing the Correct Heat Meter for more info. 

Here are our recommended heat meters, all meters are MID approved, class 2 accuracy and M-BUS output: 

Up to 7kW


Sontex Superstatic 789 Heat & Cooling Meter. 3/4" BSP qp 2.5m3/hr
- 0.25m pressure drop @ 5kW dt5 GREAT
- 0.35m pressure drop @ 6kW dt5 GOOD
- 0.48m pressure drop @ 7kW dt5 ACCEPTABLE


Up to 10kW


Kamstrup Multical 403 Heat Meter. 3/4" BSP qp 2.5m3/hr
- 0.28m pressure drop @ 8kW dt5 GREAT
- 0.44m pressure drop @10kW dt5 ACCEPTABLE


Up to 16kW

Kamstrup Multical 403 Heat Meter. 1" BSP qp 3.5m3/hr
- 0.45m pressure drop @ 16kW dt5 ACCEPTABLE


Heat Meter Power supply: Sontex heat meters are powered by the M-Bus reader with backup battery. Kamstrup heat meters have 16 year battery life and battery is user replaceable, 240V option is available for Kamstrup, Please contact us if you would prefer 240V power supply. 

Glycol: By default these heat meters DO NOT support the use of glycol. If you're using glycol please contact us quoting glycol % and brand of glycol, so a calibration factor can be applied to the heat meter. This factor cannot be applied retrospectively. 

Electricity Meter(s) 


To calculate COP we need to accurately monitor electrical input. We recommend monitoring electrical power used by both the outdoor heat pump unit and the indoor unit including pumps etc. This will usually require at least two electricity meters: one to monitor the circuit feeding the outdoor unit and the other to monitor the indoor control unit which should also include the pumps. Ideally a third meter can be used to monitor the immersion.

We use SDM120 MID approved meters with Modbus output, the meters must be installed inline on the AC circuits. 


The meters are pre-installed in a metal DIN-mount enclosure with 25mm glands. 

The SDM120 is single-phase, please contact us if you require three-phase. 


The emonHP datalogger requires an internet connection. It can be connected via Ethernet or WiFi. We recommend Ethernet connection if possible for reliable connection. If Ethernet is not possible, WiFi can be used

To ensure hassle-free installation please provide WiFi SSID & password, so the unit can be pre-provisioned to automatically connect