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