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LEFOO LF31 Air Differential Gas Pressure Controller Furnance Ven


LEFOO LF31 Air Differential Gas Pressure Controller Furnance Ven


Product description

LF31 switches offer pressure, vacuum and differential models capable of sensing very low setpoints, and switching current up to 5A resistive, 2.5A inductive. Designed for use in the HVAC industry. The LF31 is a favorite with leading manufacturers of gas-fired warm air furnaces and water heaters. Smaller and lighter than any other HVAC pressure switch, the LF31 is built for the same temperature range and operating life as conventional switches made of stamped steel. The LF31 will perform equally well in other applications which demand low OEM unit cost, robust design, setpoint accuracy, and high reliability. The LF31 features a unique integral snap switch, with positive snap action and self-wiping silver contacts for ultra-reliable switching. The molded silicone diaphragm converts very low pressure or vacuum into movement of an actuator disk, which operates the silver alloy contacts. The switch comes with UL and CE agency approvals.

LEFOO LF31 Air Differential Gas Pressure Controller Furnance Ven


Energy for ecodevelopment

HELIO's contribution

HELIO is an international network of economists, energy experts and analysts that monitored the impact of energy policies on ecodevelopment.

Our system of indicators

Hydro, Eolien, Light, Insulation, Organomasse

HELIO International's name comes from the various energy options that best support ecodevelopment. The idea was born in 1996 during preparations for RIO+5. HELIO obtained its not-for-profit status in July 1997 and is registered under the French Law of 1901.

Our objectives

  • Analyse whether energy policy was supporting ecodevelopment

  • Assess whether existing and future energy assets were vulnerable to the impacts of climate change

  • Call attention to a smart energy path approach to ensure ecodevelopment

HELIO has proudly held a unique place in the global environmental movement. It owes this to its members, who have been professionally demanding and dedicated to the public good globally.

Dr. Hélène Connor

Founder and Honorary President

What is ecodevelopment ?

Ecodevelopment is sustainable and equitable development for all. It is the use of natural resources with usufructal technologies and the regulation of markets with participatory governance. The harmonious interaction between the environment and markets results in ecodevelopment.

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HELIO network & reports

Click an area to browse all local reports



sep EERA – Compte rendu de l’atelier de mobilisation des décideurs – Benintipee TIPEE Report – Benin 2014var Energy systems in Benin (2009)_ENPyle PS900 Audio Processorsew Énergie et écodéveloppement: République du Bénin (2006)sew Energie et Ecodéveloppement au Bénin (2002)


sew Energy and Sustainable Development in Botswana (2002)

Burkina Faso

var Energy Systems in Burkina Faso (2009)_ENvar Energy Systems in Burkina Faso (2009)_FRsew Renforcer la résilience des systèmes énergétiques et des écosystèmes au Burkina Faso (2007)


hifi HIFI_Methodology brief_ENtipee TIPEE Case Study: Cameroon (2011)sew Sustainable Energy Report: Cameroon (1998)var Energy Systems in Cameroon (2009)_ENvar Energy Systems in Cameroon (2009)_FRsew Énergie et écodéveloppement en Cameroun (2006)hifi HIFI_Manuel_FR


var Energy Systems in Kenya (2009)_ENBurton Toddler Mitten


sep INSIDE STORY: Working towards a Smart Energy Path – Experience from Benin, Mali and Togosep EERA – Compte rendu de l’atelier de mobilisation des décideurs – Malitipee TIPEE Report – Mali 2014var Energy Systems in Mali (2009)_ENvar Energy Systems in Mali (2009)_FRsew Renforcer la résilience des systèmes énergétiques et des écosystèmes en Mali (2007)sew Énergie et écodéveloppement en Mali (2006)sew Energie et Ecodéveloppement au Mali (2002)


var Energy systems in Nigeria (2009)_ENvar Energy systems in Nigeria (2009)_FRsew Strengthening Energy and Ecosystem Resilience in Nigeria (2007)_ENsew Strengthening Energy and Ecosystem Resilience in Nigeria (2007)_FR


var Energy Systems in Senegal (2009)_ENvar Energy Systems in Senegal (2009)_FRsew Renforcer la résilience des systèmes énergétiques et des écosystèmes au Sénégal (2007)

South Africa

sew Energy and Sustainable Development in the Republic of South Africa (2006)_ENsew Energy and Sustainable Development in the Republic of South Africa (2006)_FRsew Energy and Sustainable Development in South Africa (2002)

The Democratic Republic Of The Congo

var Energy Systems in Democratic Republic of Congo (2009)_ENvar Energy Systems in Democratic Republic of Congo (2009)_FRsew Renforcer la résilience des systèmes énergétiques et des écosystèmes en République Démocratique du Congo (2007)sew Énergie et écodéveloppement en République Démocratique du Congo (2006)


sep VEDA Note Technique – Togo / SEP Technical Note – Togo FRsep VEDA Note Technique – Togo / SEP Technical Note – Togo_ENLoaf Pan with Lid, Non-Stick Bakeware Carbon Steel Bread Toast Mtipee TIPEE Case Study: Togo (2011)hifi HIFI_Manual_ENhifi HIFI_Methodology brief_FR


var Energy Systems in Uganda (2009)_ENvar Energy Systems in Uganda (2009)_FRsew Improving Energy Resilience in Uganda (2007)_ENsew Improving Energy Resilience in Uganda (2007)_FR

United Republic Of Tanzania

var Energy Systems in Tanzania (2009)_ENUAUS 2pcs Oil seal For 49cc 50cc 66cc 80cc 2 Stroke Engine Motorsew Improving Energy Resilience in Tanzania (2007)_ENEPPMO 2.45 Qt Nonstick Saucepan with Lid, Granite Non-Stick Coatsew Energy and Sustainable Development in Tanzania (2006)sew Sustainability Indicators for the Tanzanian Energy Sector (2002)


sew Energy and Sustainable Development in Zimbabwe (2002)

Guided by 7 principles

  • 1

    Be proactive rather than reactive

  • 2

    Learn by doing

  • 3

    Develop local strategies by and for local citizens

  • 4

    Facilitate and train to build-up local capacity

  • 5

    Ensure non-duplication of efforts

  • 6

    Maintain openness and transparency

  • 7

    Guarantee that solutions are environmentally, technologically and economically sustainable

HELIO is a member of the World Alliance for Efficient Solutions.
Visit website

Sustainable energy watch observatory

HELIO is known for its methodologies and indicator development.

  • SEW


    The first set of policy indicators measured a country or region’s progress towards or movement away from sustainability. This was called the Sustainable Energy Watch (SEW) indicators. More info

  • VAR


    With the increasing threat of climate change impacts, the SEW indicators were enlarged to include indicators that measured the vulnerability of energy systems to climate change and analysed the capacity of adaptation and resilience (VAR) of a country, therefore also assessing the quality of governance. This second set of indicators was called VAR indicators. More info



    Good decisions require good information. However, good information is often not readily available. HELIO’s TIPEE indicators allowed decision makers to use information at-hand to assess whether a current energy policy, under changing climatic conditions, is on track to meet ecodevelopment objectives. TIPEE is from the French and meansTraitement de l’information pour des politiques énergétiques favorisant l’écodéveloppement. More info

  • SEP


    The Smart Energy Path (SEP) includes all stakeholders as joint decision-makers. Together they identify a viable long-term future, requiring only or mostly local energy resources. This ecodevelopment planning is done using backcasting. More info

  • HIFI


    The HELIO Index for Investors (HIFI) helps financiers identify countries best-suited for investment based on how well a country’s energy policies are conducive to the ecodevelopment of the country. Countries practicing SEP would qualify for such investments. More info

The encompassing nature of ecodevelopment, coupled with HELIO's philosophy of inclusive participation, allowed for dialogue and debate across disciplines, countries and even cultures.


Founding Board Secretary, Project Director & Board Member

Other tools

  • CUBE

    HELIO defined public participation procedures to allow energy users and civil society to be better informed and participate in the energy planning processes as a result of liberalised European power markets.

    More info
  • Climate CDM / SSN

    HELIO was a key partner in identifying and developing initiatives around climate change, sustainable development and poverty alleviation.

    More info

    HELIO developed a monitoring methodology, used by SSN and WWF to create the GOLD STANDARD to select energy and climate projects compatible with the Kyoto Protocol.

    Visit website
  • Peace & Climate

    The vast sums of money and human resources which are currently flooding into non-renewable energy and into the arms industry supporting war must be diverted to development of an equally profitable economy based on renewable energy and eco-development, with the potential to address climate change and encourage conflict prevention.

    MOCA Engine Coolant Thermostat Housing Assembly Compatible for 0

Observer at UN conferences


HELIO participated in all the UNFCCC Conference of Parties up to COP21, hosting numerous side-events and presenting its on-going work. At COP5 HELIO introduced the first set of indicators to measure the sustainability of projects under the Clean Development Mechanism (CDM). HELIO presented its latest tools - HIFI and SEP - at COP21.


At RIO+10 (WSSD) HELIO coordinated the French NGO and official contribution on energy. HELIO also presented a major report within the official events in cooperation with International Energy Agency and the World Energy Council. The report used the SEW indicators to track the contribution of energy policies worldwide to ecodevelopment.


  • Responsible for the overall direction of HELIO including providing oversight for the organisation's finances.

  • Responsible for developing and adapting the HELIO indicators as well as providing technical assistance.

  • Responsible for identifying and communicating regional issues to the HELIO Secretariat.

  • Responsible for identifying and coordinating the work of in-country reporters.

  • Responsible for preparing country-level reports, using HELIO’s methodologies and Sustainable Energy Watch indicators.

In 2015, after twenty years of operation, HELIO International decided to discontinue its in-country activities. It now concentrates its resources and knowledge through this Creative Commons website. HELIO’s methodologies, indicators and tools remain available to all; to be used in promoting ecodevelopment through better decision-making and planning in the energy sphere.

The African arm of HELIO International has been created. It is working in Central and West Africa as HELIO-Afrique.