Questions tagged [hydronic]

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Grundfos Alpha pump shows 0 GPM but consumes power and heating works?

I have some heating zones which run off a Grundfos Alpha pump which is set to the "auto" mode. Heating seems to work fine - rooms heat up normally and this doesn't seem to take an unusually ...
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2 votes
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49 views

How to remove a Honeywell Braukmann 104v radiator actuator

I have a radiator with a Honeywell 104V radiator actuator that I'd like to replace, I think it's P/N T104V1422. I can't seem to figure out how the thing is connected to remove it. The rest of the ...
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1 vote
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175 views

Wifi thermostat to replace old mechanical 2-wire 110V Honeywell?

I have hydronic baseboard heating in my house, which is controlled by an old mechanical Honeywell thermostat. The Honeywell is 110V and connected with 2 wires (black/red). There is a bare ground wire ...
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How to calculate heat loss for sizing of supplemental heat source?

If a home uses a supplemental heat source such as electric baseboard or hydronic panel radiators to raise the room temperature by 10 degrees, how do you calculate the BTUs required in a given room? I ...
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Is there a way to have one thermostat control a heat pump and a 3 zone hydronic system?

I have two heating systems that are independent of each other. One is a 3 zone hydronic system with 3 thermostats controlling a pump controller. The second system is a air to air heat pump without ...
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1 vote
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415 views

Taco zone controller - blinking yellow light?

I have a Taco ZVC406 zone controller. This is the type which takes signals from multiple thermostats and uses relays to switch on the heating loop pump. I am using a Honeywell CT87K thermostat on one ...
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1 vote
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What is the advantage of a using a "Zone Controller"?

Looking at most pre-fab hydronic panels, the provide a Zone Controller. Initially I though they were used to stage the activation of the pump until after the valve was able to open but, looking at ...
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1 vote
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97 views

Hydronic Heating: Noisy pipes in the basement/walls

My issue is i have a natural gas boiler + hydronic heating system (two zones). It seems that after I remove air from each zones, the heating system is quiet until 12 hours later. In the early morning ,...
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1 answer
56 views

How does hydronic heated flooring work with hardwood?

I'm interested in putting Hydronic heated floors in a small cabin I'm building. I've done this before with tile but I really want to use hardwood in this cabin. I've seen it done before. I don't ...
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642 views

Slant/Fin Victory II Boiler - How do I turn on?

This summer, we moved into a home that has sub-floor heating installed. However, I have no idea how to use the boiler or turn it on. The boiler itself (a Slant/Finn Victory II gas-fired boiler) has ...
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  • 101
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440 views

single radiator whistling and whirring on and off (hot water system)

As the question stated, I have a single radiator whistling and whirring on and off and I am trying to understand the cause, so I can stop it. It is a fairly high pitched whistle/whirr/squealing sound. ...
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-1 votes
1 answer
229 views

Calculating the feet of head for a single loop cast iron radiator system

I am trying to figure out how to calculate the total equivalent length of a loop with cast iron radiators. The pipes and fittings are easy to calculate because pipe is calculated linearly, and the ...
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1 answer
948 views

Where to place an aquastat that is external to the hot water tank?

If you need to retrofit an aquastat to a heating system what is the best way to do so? i.e., in some hot water tanks or even boilers there may be a purpose-made port specifically to accept a "well" ...
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-1 votes
1 answer
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Nest E thermostat on ancient 2-wire Bryant boiler system with 2 zonesq

I have a 2-zone hydronic system running off an ancient Bryant boiler. Power is supplied by a 24V transformer, and each red wire passes through a Taco zone valve before heading off to the appropriate ...
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