Every week a question comes into R. L. Deppmann about the minimum flow rate through hydronic pumps and the best way to achieve it. Today, …
Gas Fired Water Heaters – Multiple Units and Future Capacity
When determining the size and number of water heaters to meet the customer’s needs, there are many factors to consider. How many water heaters do …
Commercial Gas Fired Water Heaters – The Battle Between Tankless & Storage: Risk and Reward
Gas fired tankless and tank storage water heaters are choices for the consulting engineer in commercial and institutional buildings. There are many marketing pieces supporting …
Steam Condensate Return Transfer Pump Inlet
One of our many new employees asked a valid question about cast iron condensate unit pump construction. The employee has worked in the HVAC plumbing …
Hydronic System Automatic Air Vents
There are many types of air vents in hydronic heating and cooling HVAC systems. It is not unusual to see an engineered set of drawings …
Selecting Air Vents For Hydronic Systems With Glycol
Sometimes simple things can slow you down in the design of hydronic heating and cooling systems. Air vents for use in water and glycol systems …
HVAC Magnetic Meters and Pipe Diameters: Installation Tip
Mechanical rooms seem to get tighter every year. The engineer begs for space, but in the end, the mechanical room piping is very tight. Now …
A Mobile App for Domestic Hot Water Recirc. & Residential Circulators
Someday, there will be a mobile app that can provide a warning when your domestic water and/or residential heating pumps stop working. For smaller gallon …
Boiler Safety: CSD-1 Emergency Shut-off Switches
The ASME CSD-1 Controls and Safety Devices for Automatically Fired Boilers is a standard for many State codes including Michigan and Ohio. This standard exists …
Variable Speed Chilled Water Systems: Demand Reset
There are multiple methods to vary pump speed in HVAC chilled water systems. A common method is the use of a differential pressure transmitter at …