This is the second set of slides for Boiler Part I, continuing to explain some of the main components of a heating system and how they work. Parts addressed in this set of slides include zone valve controller, circulator flanges, zone valve, ball valve, boiler drain, temperature gauge, fill valve, backflow preventer, boiler reset control and check valve.

1. Guide to Boiler Heating System
Components: Part II

2. There are many different components to each boiler heating system.
PexSupply.com can work with you to make sure you have all of the parts,
installation equipments and planning pieces needed for your next DIY project.
Boiler Heating System Components:
1 - Boiler 11 - Zone Valve Controller
2 - Indirect Water Heater 12 - Circulator Flanges
3 - Boiler Header 13 - Zone Valve
4 - Low Water Cut-Off 14 - Ball Valve
5 - Switching Relay 15 - Boiler Drain
6 - Thermostat 16 - Temperature Gauge
7 - Circulator 17 - Fill Valve
8 - Tempering Valve 18 - Backflow Preventer
9 - Expansion Tank 19 - Boiler Reset Control
10 - Air Eliminator 20 - Check Valve

3. Heating System Diagram

4. 11 – Zone Valve Controller
Zone valve controllers help organize wiring and
reduce problems caused by incorrect wiring
associated with conventional zone valve
installations.
Shop Now:
• Taco Zone Valve Controls
Learn More About Zone Valve Controllers

5. 12 – Circulator Flanges
For proper installation of flanged circulator
pumps, flanges are necessary to connect to the
water line.
Shop Now:
• Taco Iron Body Flanges
• Taco 1400 Series Flanges
• Taco Bronze Body Flanges
• Bell & Gossett Flanges
• Webstone Isolation Flanges
• Grundfos Flanges
Learn More About Circulator Flanges

6. 13 – Zone Valve
Zone valves are used to control water flow in a
hydronic heating system.
Shop Now:
• Honeywell Zone Valves
• Taco 570 Zone Valves
• Taco Zone Valve Controls
Learn More About Zone Valves

7. 14 – Ball Valve
Ball valves are usually used as a shutoff device in
heating and plumbing systems for gas, oil, or
water. There are a variety of ball valves available
including:
•PEX Shop Now:
•ProPEX • PEX Ball Valves
•SharkBite • ProPEX Ball Valves
•Propress • SharkBite Ball Valves
Learn More About Ball Valves

8. 15 – Boiler Drain
There are two types of boiler drains:
• Male (MIP)
• Female (FIP)
They are identified by the IPS threats on the inlet
side. Boiler drains are designed to drain the water
from a boiler and are useful for clearing away any
accumulated sediment in the boiler.
Boiler drains are typically used in laundry tubs and
washing machines.
Learn More About Boiler Drains

9. 16 – Temperature Gauge
Pressure gauges and temperature gauges
measure the pressure or
temperature, respectively, of a liquid or gas in a
system.
Brass and stainless steel are commonly used to Shop Now:
construct these gauges.
• Ashcroft Gauges
• Cash Acme Gauges
Some temperature gauges have special features • Johnson Controls Gauges
for easy readability, such as digital reads or • Honeywell-Sparco Gauges
illuminated dials.
Learn More About Temperature Gauges

10. 17 – Fill Valve
Fill valves are used to adjust the fill rate of
boilers by controlling boiler water feed
pressure. When used properly, fill valves
help prevent heating systems from over
pressurization.
Learn More About Fill Valves

11. 18 – Backflow Preventer
Backflow preventers are important to the
system because they prevent potential
hazards from harming the potable water
system. They stop fluids from the heating
system from flowing backwards into the
domestic water supply.
Each year there are over 10,000 reported
cases of backflow contamination.
Contaminations can be prevented by having
the right backflow preventer in place.
Learn More About Backflow Preventers

12. 19 – Boiler Reset Control
Boiler reset controls are used to help
regulate the temperature of the supply
water.
Shop Now:
• Honeywell Boiler Controls
• Tekmar Energy Efficient
Boiler Controls
Learn More About Boiler Reset Controls

13. 20 – Check Valve
Check valves, also known as swing checks,
help guide the water flowing through your
system in the preferred direction.
Contaminated water is not allowed to flow back
into the system. In systems that are zoned by a
circulator, check valves also stop water from
flowing to zones that are not calling for heat
Learn More About Check Valves

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