Low Temp Hydronics Class with John Siegenthaler

Low Temp Hydronics Class with John Siegenthaler

Most hydronic heating systems installed in North America from the mid-twentieth century through the 1980s were designed around high water temperatures. Fuel was cheap and the climate impacts of heating pollution was not a major concern. These high temperature distribution systems are not well suited for use with renewable heat sources, and retrofitting these systems will be an essential part of meeting Vermont’s renewable energy targets.

Air-to-water heat pumps and geothermal heat pumps, are dependent on lower water temperatures. Although renewable wood pellet, wood chip, and cordwood gasification boilers can achieve high water temperatures, their performance and efficiency is significantly enhanced when lower water temperatures are used.

Retrofitting renewable energy heat sources into existing “high-temp” hydronic distribution systems presents a significant challenge to installing contractors and engineers who must evaluate the feasibility of renewable heat source retrofits. Simply replacing existing boilers with renewable energy heat sources without evaluating the balance-of-system will inevitably compromise performance, reduce appliance life, compromise comfort, and risks homeowner dissatisfaction.

This training will examine several options for modifying existing high-temperature systems to make them compatible with renewable heat sources. We present methods for evaluating tradeoffs between load reduction through building envelope improvement, versus adding different types of heat emitters to the existing system. We detail piping methods, control strategies, calculations, and specific hardware to enable retrofitting. The training includes real-world, complete systems examples and situations to avoid.

Space is limited, so sign up now.

REGISTRATION: Engineers and HVAC Contractors



Low temperature hydronics: design details, control concepts, and system templates

Audience: HVAC professionals and Engineers
7:30-5:00 Wednesday, May 22, 2019
Landmark College, Putney VT

Continuing Education Units
– BPI (3.5credits, 7 hours)
– Efficiency Vermont/Efficiency Excellence Network (8 credits)
– VT Department of Fire & Public Safety (Approval Pending*)

REGISTRATION: Architects, Builders, Facility Managers



Low temperature hydronics: applications, benefits, and trends

Audience: Architects, Builders, Landlords, and Facility Managers
7:30-1:00, May 22, 2019
Landmark College, Putney VT

Continuing Education Units
– AIA 5 LU / HSWs
– CSL Builders (Approval Pending*)
– Efficiency Vermont/Efficiency Excellence Network (4 credits)

*If Continuing education credits are not approved, you will have the option of canceling your registration and receiving a full refund.