.5 Degree Temperature Differential On Thermostat?

[velvetfoot]

Does anybody see any downside with using a +/- .5 degree F control setting on a thermostat, when using a storage tank that is heated by a boiler? I can't. The zone pumps turn on and off more, but so what? It would make for a more comfortable house and I can see that being an advantage of having a storage tank (although, for me, it's only a 119 gallon buffer tank).

 

[Bob Rohr]

It could lead to a awful lot of cycling. Can you actually feel a .5° temperature difference?
Most wall thermostats for radiant have a 2° differential.
Then heat emitters run 10- 20° differential for radiant, up to 40° delta T in panel rads.

 

[cityboy172]

Premature relay wear would be my main concern.

 

[velvetfoot]

Can you actually feel a .5° temperature difference?

My wife can.

Premature relay wear would be my main concern.

Hmmm, I guess.

 

[stee6043]

My wife can.

I suppose you have your answer! Might as well go with it...

 

[velvetfoot]

It might help with my incorporating auxiliary heat project: https://www.hearth.com/talk/threads...ler-with-an-ecobee-smartsi-thermostat.147270/

 

[Z33]

I had to change out a Honey well stat because it was cycling my heat pump about every 10 minutes. Its a lot better to run your equipment in longer cycles and save the start up wear and tear.

 

[velvetfoot]

These at two ECM zone circulating water pumps. No other equipment comes on as a result, until the buffer tank temperature gets below a certain level.

 

[JRHAWK9]

My wife can.

LOL, we all know how women's HVAC systems are screwed up at birth.

They can be warm one minute, cold the next.... all while the temperature stays the same.

 

[velvetfoot]

With this setting, hopefully the drop of .5 degree won't be noticed. Hope springs eternal.

 

[btuser]

Do what I did. I bought the fake thermostat that says 70 degrees all the time and put the Tekmar thermistor right behind it. I also hooked the burglary system window contacts to break the call for heat so if someone opens a window the heat shuts off.

"the heat won't work"
'then shut the windows"
"what, huh HOW DID YOU KNOW"

I don't fight fair.

 

[velvetfoot]

Do what I did. I bought the fake thermostat that says 70 degrees all the time and put the Tekmar thermistor right behind it. I also hooked the burglary system window contacts to break the call for heat so if someone opens a window the heat shuts off.

That's genius!

 

[BoilerMan]

Do what I did. I bought the fake thermostat that says 70 degrees all the time and put the Tekmar thermistor right behind it. I also hooked the burglary system window contacts to break the call for heat so if someone opens a window the heat shuts off.

"the heat won't work"
'then shut the windows"
"what, huh HOW DID YOU KNOW"

I don't fight fair.

The window contacts is pure genius! Wow!

TS

 

[ewdudley]

Does anybody see any downside with using a +/- .5 degree F control setting on a thermostat, when using a storage tank that is heated by a boiler?

I'd say if the pumps were cycling of for just a couple seconds a a time it could be bad for the motor an/or relay. If pumps run for at least something like forty-five seconds that would be a long enough of a cycle to be harmless to the pump.

 

[velvetfoot]

I'd say if the pumps were cycling of for just a couple seconds a a time it could be bad for the motor an/or relay. If pumps run for at least something like forty-five seconds that would be a long enough of a cycle to be harmless to the pump.

I have it set at the minimum heat run time on the thermostat, which is a minute.