Heating Degree Days & Fuel Consumption: Part 3

Next, let’s look at the Cumulative HDDs for Manhattan from 2014 – 2017 using 55⁰F as the Balance Point:


  • 2014 (green) was the most severe heat season, finishing up with 2883 HDDs for the year.
  • 2016 (purple) was the mildest heat season, finishing up with 2229 HDDs for the year.
  • 2017 (pink) is trending closely to 2016 and will be another relatively mild heat season.

Next, let’s look at the HDD data on a month-by-month basis instead of cumulative:

  • The coldest months with the most HDDs for each year are highlighted in (red). Your fuel consumption should be highest during this month.
  • The warmest months in the heat season with the fewest HDDs are highlighted in (green). Your fuel consumption should be lowest during this month.



Heating Degree Days & Fuel Consumption: Part 2

First, let’s look at the Average Daily Temperatures for Manhattan from 2014 – 2017 and how that relates to New York’s heat season which begins October 1st and continues through May 31st:

  • Between 6:00A.M. – 10:00P.M., inside temperatures are maintained at a minimum of 68 degrees Fahrenheit when the outdoor temperature falls below 55 degrees (orange).
  • Between 10:00P.M. – 6:00A.M., inside temperatures are maintained at a minimum of 55 degrees when the outdoor temperature falls below 40 degrees (blue).

January and February obviously have the lowest Average Daily Temperatures, which means they will have the highest number of HDDs. One important takeaway from this chart is how much heating seasons can vary year to year.  For example, the Average Daily Temperature was 24⁰F in February 2015, 37⁰F in February 2016 and 41⁰F in February 2017. That’s a 17⁰F swing in only 2 years! It’s important that your boiler system is able to take advantage of the milder heating seasons so that you’re not over paying for fuel.


Heating Degree Days & Fuel Consumption: Part 1

Heating Degree Days (HDDs) are a unit of measure that indicates how mild or severe a heating season was or will be by comparing the Average Daily Temperature to the “Balance Point” which is the outside temperature below which heating is required. For example, assume there are 10 days in a month where the Average Daily Temperature is 10⁰F colder than the Balance Point and the rest of the days are above the Balance Point.  For that month there will be 10 days x 10⁰F = 100 HDDs. Trying to calculate HDDs manually can be tricky, so fortunately there are historical and forecasted HDD datasets publicly available from websites like www.weatherdatadepot.com.

Comparing this HDD data to your boiler’s historical fuel consumption can provide excellent insight into how well your boiler system responds to the changing heating loads throughout the year. Your boiler’s fuel consumption should be heaviest during the coldest months with the most HDDs, and lightest during the months with the fewest HDDs.

By Luke Wonnell

Image result for boilers

What is a Load Letter and Why Is It Important?

When a Building decides that they want to convert their oil burning boiler to one fired on natural gas, one of the first steps in the project is to complete and submit a gas “Load Letter” to Con Edison. This Load Letter can be submitted by either authorized personnel for the building or agents engaged to work on the building’s behalf such as an engineer or contractor. The Load Letter lists and describes the existing gas burning equipment for the building and their associated gas loads as well as the proposed, new equipment to be installed along with those associated gas loads. The completed Load Letter is then submitted to Con Edison for review.  During that review, the Engineering department at Con Edison uses the information contained in the Load Letter to determine if the existing Gas Service to the building is adequate or if it will need to be upgraded to accommodate the greater projected gas loads.  Upon completion of Con Edison’s review, a gas ruling and service layout is sent to the customer, contractor, or whoever is listed on the load letter as a contact. The Building can now proceed ahead with their Gas Conversion Project.

Contact us if you would like guidance and assistance in taking the next step to Convert your facility to Natural Gas.
To fill out a load letter or learn more – https://www.coned.com/en/save-money/convert-to-natural-gas/

See a Sample Load Letter Below:

Point of Entry

Once the Ruling to move forward with a natural gas conversion is received, a” POE” or “Point of Entry” appointment needs to be requested.  The POE is that location where Con Edison, or some other Natural Gas Utility, and the contractor, determine that the new gas service will enter the building.  Multiple factors need to be evaluated to select an optimal POE location. Therefore, upon request of a POE appointment, an on-site meeting is scheduled to determine a suitable location. At this meeting, field notes are generated by Con Ed which outline the interim inspection requirements and the next steps in the process, as well as show the selected POE in any available architectural site plans of the building.  The building, property and curb lines are important linear references for the POE to be accurately located. The nearest fixed reference point to the POE should be utilized for this purpose.

It is ideal to have a Contractor help you prepare for and walk you through the POE process. For additional assistance with his matter or any other related to your potential Oil-Gas Conversion, please call (201) 488-5151.

Annual Boiler Inspection

When it comes to your annual boiler inspections, the city allows clients to submit inspection results on any given day of the calendar year (as long as submitted within 30 days of the inspection date). Upon completing the annual boiler inspection, the average companies file the results to the city regardless of what they report. This can be problematic for the client as the client would then be on the clock to resolve any defects that were noted on the report.
Here at Metro, we take additional steps in order to ensure that we are submitting a clean report. To ensure that you pass your annual boiler inspection with no defects, it is best to contract with a vendor like Metro that will perform an initial inspection on your boiler, diagnose if boiler passed inspection OR if they have certain defects that need to be addressed. We then propose the items, and allow client to have opportunity to accept/decline – before we file with the city. If a client denies the proposed work, we will file with the city a report noting those defects. But if the client accepts the work, we will perform the work, re-inspect to make sure boiler meets code, and file a CLEAN report. This saves the client having to pay additional fees to make the secondary filing of an Affirmation of Corrections (otherwise known as a BO-13 form; mandatory to file if the original boiler report noted hazardous defects that were in need of correction).

What is a Boiler (ECB) Violation and Why Did I Get One?

An ECB (The Environmental Control Board) violation is issued by the Department of Buildings when a property does not comply with a part of the New York City Construction Codes and or Zoning Resolution.”

These violations are received via an inspector visiting your site and writing up any violating conditions in regards to the boiler room and the boiler(s) themselves. Unlike Annual boiler inspections, where all it takes to receive the violation is the city seeing that a filing was not done during any given calendar year, a number of these possible violations relate to code compliance for the operation of a boiler in NYC. These kinds of violations range from required repairs to the boiler vessel and/or burner, upgrades and add-ons (primarily for safety reasons) to the boiler vessel and/or burner, timely compliance with all filing and reporting requirements for the boiler, as well as items that need to be addressed to make the boiler room itself (again, primarily for safety reasons mandated by city agencies) compliant with city code.

It is possible to get a boiler violation for one of many of the reasons above.  But perhaps the most common violation is simply failing to meet the triennial filing requirements.  Boilers that are required to be registered with the Department of Buildings must also have a Triennial application from the Department of Environmental Protection, if applicable. For these cases, the client must always maintain their triennial filing requirements; as if they are not met in a timely fashion, a violation is automatically issued by the visiting city representative/inspector.