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Add vent fan to boiler
Boiler rooms get hot when boiler is ON.
This is advantage in some cases, but can create overheating problems.
AH3 delay timer and relay Add vent fan to boiler circuit so fan runs when boiler is ON.
When boiler turns off, vent fan continues running for period of time, then turns off.
 
AH3 off delay, 0-60 minute delay

Use same design to provide air to Heat pump water heater
General purpose relay with NO NC contacts needed.
Relay coil voltage that can be controlled by boiler... for example 24 VAC etc

Boiler turns on.... relay turns ON
Fan turns ON

Boiler turns OFF... relay turns OFF
Delay countdown begins
Fan continues to run
Fan turns OFF when countdown ends

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General purpose relay
AH3-3 delay timer at Amazon
Through wall fans

Through-wall fan

Resources:
How to wire twin timer
How to wire off delay timer
Override thermostat with programmable timer
AH3 delay timer and relay
Humidistat Humidistat switches
Control and/or measure humidity
Use to automatically turn on vent fan

Buy:
Humidistat at Amazon

Resources
DH55 instruction manual

AH3 delay timer and relayOverride circuit with Humidistat.
High humidity can cause mold and/of general moisture conditions that are harmful to metal, drywall, etc.

Vent fan operates with boiler as described above, and independent of boiler when humidity exceeds set point

Buy:
Humidistats at Amazon
AH3 delay timer and relayOverride circuit with Humidistat, and timer.
High humidity can cause mold and/of general moisture conditions that are harmful to metal, drywall, etc.

Vent fan operates with boiler as described above, and independent of boiler when humidity exceeds set point, and/or when timer is activated.

Buy:
Humidistats at Amazon
Intermatic FD timer at Amazon

Resources
Compare countdown timer
How to wire timers
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Troubleshoot electric water heater
Point of use water heaters

surge protection
Resource:
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Resources:
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Icon gas valve

Install and troubleshoot garbage disposal Waste King disposal
How to wire tankless electric


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