Explore heat meters from Sontex, Meters UK, Kamstrup, Engelmann, Itron CF ECHO, ista and more. ECOSPARES supplies leading brands, while TISIGO provides expert replacements for RHI, biomass and ground-source systems across England and Wales.

 

A heat meter is only useful when it is correctly selected, installed and commissioned. Pipe size alone is not enough: the meter must suit the actual flow rate, temperature range, installation orientation, sensor arrangement, communication requirements and purpose of measurement. That is particularly important where readings support Renewable Heat Incentive (RHI) payments, tenant billing, energy management or formal reporting.

ECOSPARES can supply a meter on a supply-only basis, while TISIGO can manage the complete heat meter replacement from the initial assessment to the final commissioning records. Although much of our experience is with biomass boilers and ground source heat pumps, we can assess meters for other water-based heating, cooling, heat-network, commercial and industrial applications, subject to survey and the applicable metering requirements.

What does a heat meter measure?

A heat meter measures thermal energy transferred through a system. It normally combines three elements: a flow sensor, a matched pair of temperature sensors on the flow and return, and a calculator. The calculator uses the volume of fluid and the temperature difference to determine the heat energy transferred, usually displayed in kWh or MWh.

Heat meters are used in many settings, including:

1.    Non-Domestic RHI-accredited biomass boiler installations.

2.    Ground source and air source heat pump systems.

3.    Commercial plant rooms, factories, farms, schools, hotels, care facilities and public buildings.

4.    District heating, communal heating and heat networks.

5.    Landlord sub-metering, tenant billing and cost allocation.

6.    Heating and cooling energy monitoring, building management systems and efficiency projects.

Heat meter brands supplied and supported

We are brand-independent. ECOSPARES can supply or source heat meters from leading manufacturers and specialists, while TISIGO can replace a wide range of existing meters. Our online range includes Sontex heat meters, calculators and complete kits; other makes and configurations can be quoted to suit the system.

Brand	Typical product family or use	How we can help
Sontex	Supercal and Superstatic thermal energy meters, from compact applications to larger plant rooms.	Available online from ECOSPARES; additional sizes and configurations can be quoted.
Meters UK	UK heat-metering and thermal-energy calculation solutions for commercial and monitoring applications.	Supply, replacement and compatibility assessment available by enquiry.
Kamstrup	MULTICAL calculators and ultrasonic heat-metering solutions used across residential, commercial and utility applications.	Like-for-like and alternative replacement options assessed against the existing arrangement.
Engelmann	SensoStar heat meters, including compact and ultrasonic options for heating and cooling systems.	Specification checked against flow, pipework, sensors and communication requirements.
Itron	CF ECHO II ultrasonic compact heat meters and associated thermal-energy metering products.	Replacement and alternative selection available subject to system data.
ista	Heat-metering systems including sensonic and ultego product families for building and plant-room applications.	Existing meter and integration requirements reviewed before quotation.
Other manufacturers	We can assess other established heat meter brands and legacy models, including discontinued units.	A current equivalent may be recommended where a true like-for-like product is unavailable.

Brand and model availability changes. Every recommendation remains subject to technical suitability, current approvals where required, and confirmation at quotation.

Why the correct specification matters

Two meters with the same pipe connection are not necessarily interchangeable. Before recommending a replacement, we may need to confirm:

7.    Nominal diameter, connection type, face-to-face length and available installation space.

8.    Design and operating flow rates, including the meter's nominal flow value (qp) and pressure loss.

9.    Flow and return temperatures, temperature differential and whether glycol is present.

10.      Whether the flow sensor is installed in the flow or return pipe and the required orientation.

11.      Temperature sensor type, pocket dimensions, cable length and matched-pair requirements.

12.      Heat-only, cooling-only or combined heat-and-cooling measurement.

13.      Battery, low-voltage or mains power requirements.

14.      Pulse, M-Bus, wireless M-Bus, Modbus, BACnet, analogue or other communication outputs.

15.      Display units, data logging, remote reading and building-management-system integration.

16.      The regulatory or contractual purpose of the reading, including RHI, billing or internal energy monitoring.

Non-Domestic RHI heat meter replacement: the current ten-year rule

The Non-Domestic RHI is closed to new applicants, but accredited installations continue to have ongoing obligations. Under Ofgem's current participant guidance, meters and steam-measuring equipment must be recalibrated or replaced in accordance with the manufacturer's instructions or within ten years of initial installation - whichever is sooner.

Replacement is therefore not the only permitted route in every case. Recalibration may be possible, but it must meet the relevant manufacturer and Ofgem evidence requirements. In practice, replacement is often the clearer and more economical option where a meter is obsolete, faulty, unsupported, difficult to recalibrate or already due for wider system changes.

Ofgem's meter replacement guidance states that participants must update the application after a replacement. Current guidance requires notification within 28 days of the change and identifies supporting information such as the replacement date and reason, photographs and date-stamped evidence, an installer declaration and an updated schematic. The participant remains responsible for making the notification, keeping evidence and satisfying Ofgem's final requirements.

Before the old meter is removed, good evidence practice includes:

17.      Recording the old meter serial number and final reading.

18.      Taking clear, date-stamped photographs of the old meter, its installation and the reading.

19.      Recording the new meter model, serial number, initial reading and installation date.

20.      Taking clear photographs of the installed meter, sensor positions and calculator display.

21.      Updating the metering schematic and retaining the commissioning and installation records.

22.      Submitting the required amendment promptly and retaining copies for the duration required by the scheme.

TISIGO has replaced hundreds of heat meters

TISIGO has replaced hundreds of heat meters for Non-Domestic RHI users across England and Wales. This includes meters serving biomass boilers and ground source heat pump installations, from smaller commercial plant rooms to larger and more complex renewable-heating systems.

That field experience matters because the job is rarely just a mechanical swap. Our engineers consider the complete metering arrangement, the existing sensor locations, flow direction, pipework, wiring, calculator settings, displayed units, communication outputs and the records needed after commissioning. You can review TISIGO's professional accreditations and memberships before instructing us.

Clients choose TISIGO because we offer:

23.      Hundreds of completed heat meter replacements and extensive renewable-heating experience.

24.      Brand-independent advice rather than forcing every site into one manufacturer's product range.

25.      Supply, installation, commissioning and practical evidence capture in one coordinated service.

26.      Coverage throughout England and Wales for individual sites and multi-site programmes.

27.      Experience in biomass, ground source heat pumps and wider commercial hydronic systems.

28.      Straightforward technical advice focused on the correct outcome, not unnecessary upselling.

Our heat meter replacement process

29.      Initial review. We obtain photographs, model and serial details, pipework information, the current meter reading, system type and the reason for replacement.

30.      Technical selection. We check the proposed meter against flow, temperature, pipework, sensor, power, communication and regulatory requirements.

31.      Quotation and planning. We confirm whether the job is supply-only or a managed replacement, the likely shutdown requirement and any enabling work.

32.      Removal and evidence capture. The existing meter details and final reading are recorded before it is safely isolated and removed.

33.      Installation and commissioning. The new meter, sensors and calculator are installed, configured and checked for plausible readings and correct operation.

34.      Handover. We provide the available installation and commissioning records, meter details and photographs needed for the client's records and any applicable notification.

Downtime varies by system. Some replacements are straightforward; others require draining, valve work, pipework modification, electrical changes, new sensor pockets or coordination around production and heating demand. We assess this before attendance wherever the available site information allows.

More than biomass and ground source heat pumps

TISIGO's strongest track record is in renewable-heating and RHI work, but heat metering is used much more widely. Subject to a suitable technical review, we can assist with:

35.      Air source heat pump and hybrid heating systems.

36.      Commercial boiler rooms and energy centres.

37.      Heat networks, communal systems and district heating.

38.      Landlord, tenant and departmental sub-metering.

39.      Industrial process heat and energy-efficiency monitoring.

40.      Heating and cooling meters connected to BMS or remote-reading platforms.

Where readings are used for billing, statutory reporting or another regulated purpose, that purpose must be disclosed before selection. It can change the approval, accuracy, sealing, evidence and data requirements.

Heat meter replacement across England and Wales

From its base in Preston, TISIGO supports heat meter replacements throughout England and Wales. Our engineers travel for commercial, industrial, agricultural, public-sector and multi-site work, including the North West, North East, Midlands, London and the South East, South West, North Wales and South Wales.

For organisations managing several RHI-accredited systems, we can discuss a planned meter replacement programme rather than treating every site as a separate emergency. Grouping survey data, meter procurement and regional visits can reduce disruption and improve control of replacement deadlines.

Buy a heat meter or arrange a complete replacement

If you know the specification you need, you can shop the ECOSPARES Sontex heat meter range. For other brands, larger meters, legacy replacements or unusual communication requirements, contact us with the existing meter details and we will assess the most suitable supply option.

If you need the complete service, request a heat meter replacement from TISIGO. We can help with a single failed meter, a ten-year RHI replacement, a ground source heat pump meter, or a coordinated programme across multiple sites.

Call 01772 284 626  |  Email info@tisigo.co.uk

Frequently asked questions

Which heat meter brands do ECOSPARES and TISIGO support?

We supply, source or replace leading heat meter makes including Sontex, Meters UK, Kamstrup, Engelmann, Itron CF ECHO II and ista, as well as other established and legacy products. Availability and suitability are confirmed against the application.

Does TISIGO replace Non-Domestic RHI heat meters?

Yes. TISIGO has replaced hundreds of meters for Non-Domestic RHI participants, particularly on biomass and ground source heat pump systems across England and Wales.

Must an RHI heat meter always be replaced after ten years?

Not necessarily. Current Ofgem guidance allows recalibration or replacement within ten years of initial installation, or sooner where the manufacturer's instructions require it. The chosen route must satisfy the applicable evidence and ongoing-obligation requirements.

When must Ofgem be told about a replacement?

Current Ofgem guidance requires notification within 28 days of a recalibration or replacement. The participant should check the latest requirements and retain clear evidence of the old and new meter details, readings and installation.

Can a different brand replace the existing heat meter?

Often, yes, but only after checking the complete specification and metering arrangement. Pipe size, flow rate, temperature range, sensor arrangement, communication outputs, approvals and the purpose of the reading all matter.

Can TISIGO replace ground source heat pump meters?

Yes. Ground source heat pump metering forms a significant part of our experience, including meters used for Non-Domestic RHI purposes.

Do you work on systems other than biomass and ground source?

Yes. Subject to survey, we can assess heat meters for air source heat pumps, commercial plant rooms, heat networks, tenant sub-metering, industrial process heat, heating and cooling systems and BMS-connected applications.

Can I buy a heat meter without installation?

Yes. ECOSPARES offers supply-only heat meters, including an online Sontex range. If the exact unit is not listed, send the specification or photographs for a project quotation.

How do I obtain a heat meter quotation?

Send the meter make and model, serial number, clear photographs, pipe size, flow information, system type, site postcode, communication requirements and any available schematic. We will confirm what else is needed before quoting.

Does TISIGO cover all of England and Wales?

Yes. TISIGO undertakes heat meter work throughout England and Wales, subject to engineer availability, site requirements and an agreed quotation.

Get sorted today

Whether you need a Sontex heat meter from ECOSPARES, a replacement for a Kamstrup, Engelmann, Itron CF ECHO II, ista or Meters UK system, or an engineer to manage a complete RHI meter change, speak to our team. TISIGO's heat meter replacement service is available across England and Wales.

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