M2G FAQs

A. Over the last 13 years and nearly 10,000 installations, in-depth measurement and verification projects in the field show energy consumption (cost) savings of between 10% and 25%. When estate-wide installations are analysed average savings of 12%-15% are achieved. All savings published by Sabien are from client sites and the data is normalised using Degree Days to allow for the impacts of weather or normalised using water consumption or footfall to ensure the savings reported are accurate. Sabien follows the IPMVP for all its measurement and verification projects.

A. M2G is a low cost technology to deploy across an estate, typical paybacks are well under 2 years and the ROI can be significant.

Our measurement and verification procedures are carried out in line with the requirements of the International Performance Measurement and Verification Protocol (IPMVP). This defines a best practice framework for quantifying the results and benefits of energy efficiency investments. Importantly, it ensures there is total clarity and transparency for all parties in relation to the scope of work from initial planning, the measurement methodology, through to the validation of results.

Importantly, the savings are not downloaded from the M2G, instead independent data logging equipment is installed and all variables are captured to ensure the results you receive are reflective of kWh and £ saved. Furthermore, Sabien also provides post-installation verification, enabling full business case realisation to be completed.

When comparing the energy consumption of heating plant before and after an energy-saving initiative it is essential to take account of any variation in outdoor temperatures. Put simply, comparing gas consumption from a cold winter with that for a mild winter is meaningless. The answer is to use degree day data provided by the Meteorological Office to adjust gas consumption figures accordingly and provide an accurate picture of performance based on the heating requirements during variable weather conditions.

Any analysis and savings presented that does not include Degree Day normalisation will be incorrect.

A. There are no hidden charges. Installation and end-to-end project management is included as standard. Furthermore, M2G does not require annual maintenance or seasonal calibration and comes with a 5-year warranty as standard.

A. Organisations using M2G include Lincolnshire County Council, BT, MoD, Norland Managed Services, Lloyds Banking Group, BNP Paribas Real Estate, Vodafone, Defra, and the Environment Agency. For a more comprehensive list and more detail on projects please visit our latest case studies.

Many of the UK’s and Europe’s leading Facilities Management companies, Energy Suppliers and M&E providers are recommending M2G to their clients. These include; Mitie, EDF Energy, Norland Managed Services, Jones Lang LaSalle, Carillion, ISS, and Cofely. M2G and M1G available in over 30 countries, with installations in China, Australia, India and the USA.

A. Boiler dry cycling is a known issue and has been recognised for many years. Unfortunately in the past a number of products were developed to address it, however the control strategies used caused issues and did not deliver actual kWh savings. Please note that many of these products have re-emerged when the demand for energy efficiency increased.

The old way of doing it is to either delay boiler firing based on historic firing patterns, allowing the boiler to cool down and not use real time data. Or artificially lower each boiler’s set point temperatures.

There are two drawbacks to this approach. Firstly, supressing the boiler’s set point could lead to comfort levels being affected within the building. Secondly, it can potentially cause conflicts with the existing controls (e.g. BMS), resulting in BMS alarms being triggered and conflicts with variable temperature controls e.g. weather compensation and sequencing.

M2G is a patented technology that works by constantly measuring and analysing the temperature profile of each boiler in real time and adapting to variable set points. The M2G is applying dynamic management to each boiler.

The boiler has to reach its designed set point before the M2G can even begin to monitor and control the boiler. As a consequence the system temperature (common header temperatures) are never altered. See How M2G Works for more detailed information.

A. It isn’t necessarily true that reduced firing time equals reduced energy consumption. This is because most modern boilers use a modulating burner or multi-stage firing. Therefore the ’time’ element of a boiler control does not equate to the energy used i.e. fuel used.

For example: a modulating boiler firing for 5 minutes at low fire, will use much less fuel than if it was operating for 5 minutes at high fire.

It is therefore very misleading to state that the energy saved is based on a ‘time reduction’ of boilers operating. 

Also consider that if the control is holding the boiler off for a fixed period of time any genuine demand from the building may go unnoticed, resulting in potential impacts to the systems or/and building’s temperatures.

A. A properly commissioned and maintained BEMS will certainly reduce energy consumption by ensuring the building is fully optimised and that the heating system as whole is scheduled to come on at the right time, or sequence the boilers or lower the system temperature depending on outside temperature.

However, it is highly unlikely the BEMS or BMS has been programmed to optimise each individual boiler, this is where additional control is required, M2G is designed to integrate with existing BEMS/BMS to eliminate ‘dry cycling’ further reducing fuel consumption and carbon emissions.

Typically a BEMS/BMS is programmed to manage the heating system (i.e. the building) as a whole, rather than controlling the performance (fine tuning) of individual boilers. Typical BMS strategies may include optimum start/stop, weather compensation or boiler sequencing.

This is usually achieved by monitoring the blended water temperatures from all of the boilers via the common return header to the boilers rather than measuring the individual boiler(s). As a result, any energy wastage through boiler dry cycling at an individual boiler level is not always detected or prevented by the BMS control. 

A. Sabien Technology provides nationwide project management and installation, from point of sale to handover. This is a standard feature of our service offering.

A. M2G always maintains the boiler thermostat/set point and cannot invoke the ‘save’ mode until the boiler has reached the temperature it has been set to. As a result, heating and hot water levels are not put at risk.

Independently assessed case studies have demonstrated that the M2G has no impact on the room or hot water temperatures. For example, during a 12 month NHS Trust pilot it was stipulated that the pilot would be terminated immediately if there was any impact on comfort levels. Throughout the pilot and since the rollout there have been no reports of ambient room or hot water temperatures being affected.

A. Over 9,000 installations of M2G have shown that this technology consistently reduces the fuel consumption of the boiler plant and associated carbon emissions – typically by between 10% and 25%.