Questions tagged [hydronic]

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How to install hydronic radiant heat over concrete slab

I'm trying to figure out the most ideal way to install hydronic radiant heat in my basement over the existing concrete slab. I've looked at several products for heat distribution, like Warmboard, ...
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  • 87
3 votes
1 answer
6k views

Anyone installed a hot water coil in their HVAC ductwork to increase heat pump efficiency?

Hydronic heat supplement to Heat pump Home heating System. Anyone have experience putting a heating coil in the ductwork of a forced air heat pump system? Background. The existing HVAC system is a ...
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2 votes
3 answers
3k views

Can I replace hydronic water boiler return pipes with pex?

My house was built in the 1920s, the heating source was a hot water/radiator system. Originally the basement was probably used only for a coal furnace (we have the drop-off door that the coal guy used ...
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  • 163
2 votes
5 answers
133 views

How to balance hot-water heating system when farthest radiator stays cold

Is there a counterpart to the advice given in this video except for late 1940s-era convector-style radiators which do not have a valve on their return and have only an air-bleed-valve? Basically a ...
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  • 788
2 votes
1 answer
345 views

Can’t shut off power to heat-only (hydronic baseboard) thermostat

I have no AC in my condo, only hydronic baseboard heat, currently controlled by an old mercury thermostat. I have a new smart thermostat with a c-wire adapter I want to replace it. Trouble is, I’ve ...
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  • 51
2 votes
1 answer
131 views

Hydronic heat radiators not used for long time - should they be drained?

What should I do with radiators that have been out of action for about 3 years since the boiler went on the blink? Is it better to drain the water out of the system while system is dormant?
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  • 21
2 votes
0 answers
339 views

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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  • 4,974
2 votes
0 answers
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
1 answer
96 views

Is this typical for how hot water heating loops are plumbed?

First time owning a home with hot water heat, and studying the plumbing the basement, I notice that the living room/kitchen zone that has a run of baseboard, a kick panel unit, and several floor units,...
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  • 3,878
1 vote
1 answer
73 views

Home Heating Efficiency

See a similar question I posted a few years ago: Heat pump minimum compressor temprature I have a custom built new construction home, but I was not involved with the build process, so I don't know the ...
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  • 715
1 vote
2 answers
471 views

New thermostat for hydronic heating, no wiring labels, 3 wires

This hydronic system was not working when we bought our home. The fan would kick on with a manual switch but when you changed the temperature settings to go above the room temp nothing would happen. ...
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  • 121
1 vote
2 answers
217 views

Are hydronic systems set up as loops or ladders, and how can I tell the difference?

My hydronic system has a loop (or ladder) that visits baseboard radiators on four floors. All piping is hidden in the walls. On the attached diagram, squares are windows, red is baseboard radiators, ...
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  • 4,243
1 vote
1 answer
41 views

Hydronic baseboard heating and warm floors

I have hydronic baseboard heating throughout my house and have been having issues with air in the system. Since I've lived here (4.5 years) I've noticed that certain floor areas are warm where the ...
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  • 11
1 vote
1 answer
168 views

Replacing old 2-pole line volt thermostats in a 120V hydronic heating system - is this configuration safe and acceptable?

I am replacing several old mechanical 120V 2-pole thermostats each of which controls both a blower fan (which blows air over hydronic coils to push warm air into the room) and a single central ...
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1 vote
1 answer
123 views

cannot get last radiator on the line to heat up

All radiators but one are toasty. The cold one is up on the second floor, and is the last one on the line, farthest from the boiler. It has been bled of air. It shoots out a thin stream of (cold) ...
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  • 383
1 vote
1 answer
664 views

Bosch Heat Pump + Hydronic Coil?

I was hoping to get some advice on the proper setup for this system. I live in Long Island, NY and just moved into a large house with an extremely old oil burner and 3 a/c condensers. I'm about to ...
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1 vote
1 answer
871 views

Hydronic kickspace heater on same zone as cast iron radiators?

Small older home that has in-wall cast iron radiators throughout the house in a single zone. Hot water not steam. When the kitchen was remodeled years ago the cast iron radiator was removed because it ...
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1 vote
1 answer
1k views

Can I install thermostatic radiator valves on a hydronic heating system?

My house has three hydronic heatin loops; two are shaped like a ladder. The baseboard radiators are plumbed with type M copper pipe. I'm thinking about installing thermostatic radiator valves on the '...
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  • 4,243
1 vote
0 answers
136 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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  • 11
1 vote
0 answers
29 views

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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  • 11
1 vote
0 answers
33 views

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
0 answers
406 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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  • 4,974
1 vote
1 answer
127 views

What should the input pressure be for a hydronic system?

I have a boiler that's operating range is 12 to 30psi.The documentation says that it loses "efficiency" at the low end of of the operational pressure range. When looking at pressure reducing ...
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1 vote
0 answers
21 views

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
0 answers
96 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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  • 11
1 vote
2 answers
168 views

Can I run my hydronic circulator off an appliance cord in order to use it to purge air?

I have a hydronic heating system with a relatively powerful B & G circulator pump. This pump has a relay that is controlled by the furnace electronics; if there is no power to the furnace, there'...
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  • 4,243
0 votes
3 answers
4k views

What are normally-open hydronic zone valves used for?

In a hydronic (hot water) heating system electronically operated valves control whether hot water runs through a particular zone of the building, or not. It seems to be a common setup for the valve ...
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  • 4,974
0 votes
1 answer
279 views

Boiler Valve Corrosion

I have a hydronic heating system in my house, and I noticed a valve on a pressure gauge on the side of the boiler is extremely corroded (see 3 pictures below). 1) Is there any purpose for this valve ...
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  • 75
0 votes
2 answers
420 views

Difference between geothermal and regular hydronic zone valves

Taco makes two variants of zone valves - one type for general hydronic use, and another type marketed especially for geothermal use. What is the difference in valves that particularly suits them for ...
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  • 4,974
0 votes
1 answer
39 views

Parallel loop in existing FHW zone - will this work?

I have a contractor renovating a space for my in-laws, and his plumber added two kick heaters and tied them into an existing FHW zone, but did it differently than I expected. I expected him to tap ...
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0 votes
1 answer
68 views

Hydronic, In-floor, Radiant Heat

I am considering including a hydronic (Pex tubing) radiant heat system in my new house (still in the planning phase). I have done some reading/resaerch...here was a straight-forward, mercifully ...
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  • 165
0 votes
3 answers
93 views

Updating baseboard radiator

My house was built in the 50s and I believe the baseboard radiators are original. We just bought the house and I went to go clean them. I realized most of them are rusty and painted over making them ...
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0 votes
1 answer
68 views

Splitting a hydronic zone. Zone valves or separate circulator pump?

I had some plumbers take a look at my hydronic system to discuss splitting the single zone. They proposed to use separate zone pumps. In retrospect the other way to do this would be with zone valves. ...
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0 votes
1 answer
50 views

What is a media guard?

I am building a simple aquaponic system by learning from this video: https://www.youtube.com/watch?v=Lqe3IqPisns at 1:24, we will a media guard is implemented; which is basically fat tube with lots ...
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  • 169
0 votes
1 answer
704 views

What are the steps to drain and refill zone for zone valve replacement?

I have a hot water baseboard (hydronic) heating system, gas boiler. Please refer to diagram of my system below. Ball valves 1 & 2 are supply. Ball valve 3 is return. Zone valves are on supply, ...
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0 votes
1 answer
468 views

Where Can I connect my C-wire on A Hot Water (Hydronic) Heating System?

I have a hydronic heating system (Lochnivar)that came controlled with an older (dumb) thermostat. I have 5 wires behind the wall and 5 wire in the wire packet going into heating system however only ...
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  • 9
0 votes
1 answer
158 views

How do I purge the air from a hot water furnace with zones

I want to try and bleed the air from my hydronic ( baseboard ) heating system. It's a natural gas system, I think I understand the basic functionality but my system seems to be a bit unusual and I'm ...
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0 votes
2 answers
169 views

Most efficient way to improve my house's heating

I live in the mid-Atlantic in a 100 year old house, and I'm looking for a way to reduce my heating bill. Last winter, I left the thermostat at 68F, and our gas bills were incredibly high, despite ...
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0 votes
1 answer
301 views

Use CLR to clean stuck bleeder valve

I was bleeding the air out of hydronic heating zones and I notice some mineralization on bleed valve attached to my air scoop. I took the Schrader valve cap off and tapped the valve I noticed it was ...
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  • 171
0 votes
1 answer
34 views

New Thermostat Won't Engage Plinth Heating in Kitchen Island

I have two plinth heaters on either side of my kitchen island. Since the rest of the house is hydronic, I presume that these are hydronic (there is a zone valve at the boiler) with electric fans ...
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  • 171
0 votes
2 answers
294 views

What's the effect of introducing bends into a primary-secondary heating loop?

I've been learning about primary-secondary boiler systems for my home, and have landed on a two-boiler system (two apartments), very much like Siegenthaler describes in his illuminating book and here ...
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  • 115
0 votes
1 answer
815 views

Rattling sound from heating pipes

I keep on hearing a rattling sound like metal banging from 1 section of pipe in my hydronic heating system, I tried bleeding but no improvement. Thanks
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  • 412
0 votes
1 answer
1k views

pressure in boiler getting too high

The pressure relief valve on the hydronic system boiler is releasing a little water every time the boiler cycle is almost done and I looked at the gage and its rising to about 30 psi, But I can't ...
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  • 412
0 votes
1 answer
43 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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  • 1,144
0 votes
0 answers
640 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
0 votes
0 answers
439 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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  • 129
-1 votes
3 answers
107 views

How impactful will it be to lose 7' of radiant heat pipe in a room?

My home has a hydronic heating system, with fully enclosed floor radiators. In one room, there is a radiator that runs the length of the room, on the outside wall which is about 20' long. In the ...
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-1 votes
1 answer
216 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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  • 140
-1 votes
1 answer
924 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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  • 4,974
-1 votes
1 answer
1k views

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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