Domestic Hot Water Priority

 
User avatar
Lightning
Site Moderator
Posts: 14658
Joined: Wed. Nov. 16, 2011 9:51 am
Location: Olean, NY
Stoker Coal Boiler: Modified AA 130
Coal Size/Type: Pea Size - Anthracite

Post by Lightning » Mon. Feb. 06, 2023 11:40 am

Yes it would. I have a single circ setup.


 
User avatar
Rob R.
Site Moderator
Posts: 17977
Joined: Fri. Dec. 28, 2007 4:26 pm
Location: Chazy, NY
Stoker Coal Boiler: EFM 520
Hand Fed Coal Stove: Chubby Jr

Post by Rob R. » Mon. Feb. 06, 2023 11:51 am

Lightning wrote:
Mon. Feb. 06, 2023 11:40 am
Yes it would. I have a single circ setup.
In that case, I suggest skipping the DHW priority altogether. The last thing you want when it is -20F is for the circulator to not run for a period of time due to high DHW demand. The fancy zone controls do offer a "timeout" that will allow the other zones to run after a certainly length DHW priority, but even an hour with no circulation on an outside loop is risky in severe weather.

An alterative would be to drop only the zone for the main house if the boiler temperature drops below setpoint. This is less likely to cause freezing issues and you would notice it quickly.

Post Reply

Return to “Stoker Coal Boilers Using Anthracite (Hydronic & Steam)”