About this Course• This course is approved for ASPE CEU credits only• This course is not approved for PDHs for PEs• CPDs (Certified in Plumbing Design) or CPDTs
(Certified Plumbing Design Technician) can use this course towards their recertification
• aspe.org/CPD• aspe.org/CPDT
• This course may or may not be accepted for PE renewal
• Individuals must inquire with their state to determine if this is eligible for PE renewal or PDH credits
ASME AND NON-ASME TANKS
Hubbell Heaters manufactures various types of heaters including…
PACKAGED CEMENT LINED WATER HEATERS
TANKLESS WATER HEATERS
SPECIAL PURPOSE HEATERS
GAS HEATERS
ELECTRIC HEATERS
STEAM FIRED HEATERS
BOILER WATER HEATERS
Tankless Water HeatersThe Same, But Different?
Does KW+V+Ph=KW+V+Ph?
Electric Tankless Water Heaters
• Major components in every unit• What's inside and how does it work?
• Operation and component differences in the market
• What is the overall impact of these differences on both sides
• How should design adjust to accommodate the application?
So how does it work?A heater system vs. “Just a heater”
So how does it work?A heater system vs. “Just a heater”
So what does the market have in common?
The MUST Haves of Electric Tankless Heaters
Elements
Power Controls
Open Coil vs. Sheathed Element
Electric Open Coil Elements
Electric Sheathed Heating Elements
Power Control OptionsOn / Off (cont.) vs. Modulating (relay)
How Does Power Control Work?
Contactor Relay / Modulating
SSR/SCR vs ContactorWhen paired with temp controller
**Important Note** Power control does NOT equal temperature control
Looks good on paper, but…
Flow Rate Impact
Heating demand = GPM x temp rise x 0.1465 = kw0.5 x 56 x 0.1465 = 4.1kw0.3 x “X” x 0.1465 = 4.1kwX = 93.3F temp rise
Sizing Considerations
Heating demand = GPM x temp rise x 0.1465 = kw40F – 140F ?
Be aware of feedwater temperatures
A note on safety…
• Process Controls• Actively work to maintain or change process conditions
based on desired results
• Safety or Limit Controls• Ensure that the system is in a safe state based on set
limits outside of the normal process.• “System” can be a product or a process
• Can a device be both?
Process Control vs. Limit Control
Impact to Overall Project• Overall Installation Costs
• Plumbing is only part of the cost• Pipe $/ft + Labor vs. Conduit & Wire $/ft + J-Box’s + Labor
• Where does the responsibility lie?• By including controls in the unit, the result is a single
responsible party for performance, and function.• The external safety valve is able to do its job as a safety
• If you are dependent on the proper function of other manufacturer’s equipment to complete your system, who is responsible for performance, safety, and function?
• If a safety valve is used as the process control is it still a safety?
• In the event of failure, does the responsibility then fall on design without the inclusion of an additional valve?
• Is the valve function impacted by hot water temps outside of spec?
Application Considerations• Is there a possibility of varied flow, or multiple
fixtures from a single heater?• If YES, you need a temperature controller and
modulating power control• Will the application see “High” flow rates, or harsh
water?• If YES, use a sheathed element, for increased element
life• Is the installation in a “sound sensitive”
environment?• Modulating power controls have a silent operation. • Contactors make a snapping or hammering sound every
time they switch.
Modulating Universal Tankless
Single fixture, fixed flow only
Thank you
Any Questions?
Phone: 203-378-2659 Fax: 203-378-3593 Seymour Street Stratford, CT 06615 www.hubbellheaters.com