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What are the most cost efficient thermostatic valve values for UFH?

The manifolds on each floor have a thermostatic valve. I recall reading somewhere that for the most efficient system that you set these to the lowest acceptable value. I have these set to 35C. The ...
Cheetah's user avatar
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1 answer
70 views

What does it mean to say that a metal piping system must be "bonded"

What is the physical means by which a metal piping system is "bonded"? Does it mean that it is wired to the grounding bus inside the electrical panel? If so, should there be such connections ...
mr blint's user avatar
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2 answers
61 views

How would you bleed these hydronic lines?

Had to do an emergency pex repair on a section of the lines for our in-floor heat, and afterward, could not figure out the best way to bleed the lines. It was clear the way the temp shot high and the ...
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How can I provide lateral support for hydronic baseboard pipe?

I am renovating a room that has slant fin baseboard. I want to replace the slant fin hardware (cover) with a different cover style. These are high output pipes that run horizontal to each other. The ...
Rose Michel's user avatar
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0 answers
43 views

Can this drain valve be repacked?

Can this valve be packed? I've got two of them and they both leak from the stem if they are even cracked open. On most valves the stem packing nut screws down over threads on the valve, compressing ...
Sherwood Botsford's user avatar
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1 answer
25 views

How can I hook up an old cast iron hot water heater to my hydronic heating system

The existing hydronic system is run in copper with finned tubing in baseboard heating mostly. We split off a chunk of bedroom to make a small ensuite. It currently has a a 1KW electric heater. I ...
Sherwood Botsford's user avatar
2 votes
1 answer
99 views

Do I need to replace the autofill valve on my oil water heater?

I have a ~20 years old Weil-McLain Gold oil boiler connected to the forced hot water baseboard heating system in a 2-story house (two zones with separate pumps, one for every floor). The same heater ...
Shivering's user avatar
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1 answer
47 views

Will I have condensation on a slab cooled with groundwater?

New Construction, SLAB COOLING I’m planning a 24’ x 24’ two story studio with guest quarters, kitchenette & bath. The first floor heat will be an insulated concrete slab with PEX, boiler ...
Robert's user avatar
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2 votes
1 answer
281 views

Boiler heating, but no water flowing through system

My heating system stopped working this morning. It's an oil-fired hydronic system with 5 zones and hot water tank. This is what I have diagnosed so far: The thermostats are calling for heat. The ...
Cheery's user avatar
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1 vote
1 answer
245 views

Nervous About Hydronic Floor Heating

I recently installed electrical floor heating in a bathroom and I can set the temp to 90+ and it gets nice in there on the tile. My plan in our new house is to put radiant hydronic floor heat ...
scri66le's user avatar
3 votes
4 answers
2k views

How can I move a new heavy boiler to the basement and the old one up and out?

I need help moving a new boiler into my basement and to have the old boiler removed from my basement. It will be a warranty return less than 1 year of use so the old one must be kept intact. The ...
TommyO's user avatar
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1 vote
2 answers
410 views

How to increase flow without causing cavitation in hydronic heating system

I have a hydronic heating system in which water heated by a boiler is pumped around the perimeter of the house using circulator pumps. Currently the flow rate is too low, causing the boiler to ...
user169686's user avatar
2 votes
2 answers
941 views

How do I completely drain and decommission hydronic radiant heating system?

Purchased a home which has a floating floor radiant heating system installed in the basement. I am looking to remove the system as it was poorly designed and installed. I've closed off the fresh water ...
rome's user avatar
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1 answer
136 views

No water in circulator pump? Hydronic heat with electric hot water

I noticed my hydronic floor heat was no longer heating, and the circulator pump was extremely loud. This system was new in 2009 with one valve, pressure tank, and electric boiler replaced in 2021. It ...
Erik's user avatar
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1 answer
87 views

Oil boiler, remove baseboard from entire house but keep the water heater

I have a question about removing Hydronic Baseboard but keeping the boiler and water heater in place. Is this relatively straight forward? Shut off power Cut off the supply and return for the ...
Jake's user avatar
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1 vote
1 answer
939 views

Hydronic heating system uses ONE line for supply and return?

Have just bought a house in which we've inherited a hydronic system - so just beginning diagnosis and diagramming, etc. It seems that radiators use only one line for both supply and return; presumably ...
DrLou's user avatar
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3 votes
2 answers
99 views

Radiant heated floor makes noise after adding additional 1/2" of plywood

I have installed hydronic radiant heat pipes under the subfloor; used aluminum plates for spreading the heat from pex pipes. The house is old, I think the original subfloor is 5/8 Douglas fir. Up to ...
Tomas's user avatar
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1 answer
1k views

Hydronic heating system is not working, but still have hot water

A couple of days ago, my hydronic heating system stopped working. Thankfully, the boiler is still working though, so I still have hot water. The details: When no one is using hot water, the boiler ...
red.october's user avatar
0 votes
1 answer
45 views

Hydronic floor floor system problem

Here's a picture of my hydronic floor heating system with three zones. A tech came out and told me that the feeder was bad. He also told me that on the controller board everything's working as it ...
Wynne's user avatar
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2 votes
1 answer
97 views

Critique my Radiant Hydronic Heating Plan

I'm planning to install radiant heating lines in my new "studio" (essentially a detached garage). I want to save some money by doing parts of the project that I feel confident with. I think ...
Jeremy Foster's user avatar
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1 answer
41 views

I have a S-25 BF on my boiler. Downstairs is hot , upstairs -nothing. Could the impeller be bad and won't push to second floor?

I have a S-25 BF pump. Downstairs is heating fine. Not getting any heat to second floor. Tried bleeding upstairs, nothing came out. No air or water. I have 17psi at boiler. Could I have a bad ...
Michael Taylor's user avatar
-1 votes
1 answer
286 views

Why is my house freezing and my gas bill astronomical?

I live in a multifamily row house in the northeast. There is a 2 bedroom, 1 bath garden apartment plus a 2 floor duplex and a basement. I am the owner and I live in the duplex, we rent out the garden ...
SKL's user avatar
  • 19
3 votes
1 answer
424 views

Hydronic heating not working, but have hot water

I have a Navien combo-boiler system with two hydronic baseboard heating loops hooked up to it. Our on-demand water heating (showers, etc) are working fine. Both heating loops however, are not. I have ...
Havegooda's user avatar
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4 votes
1 answer
99 views

Help me Understand Hydronic System Boiler Circulator RPM / HP / Head / Flow / System Pressure [closed]

Help me understand the correlation between boiler circulator RPM / HP / Head / Flow / System Pressure - see the particulars at the bottom. CASE: My 1986 boiler came with Armstrong S25 circ (same as B&...
Roz's user avatar
  • 61
0 votes
1 answer
276 views

Adding Runtal Baseboard to a Fin Tube hydronic heating zone

I purchased some Runtal base board heaters a while ago. I am trying to install them into an existing multi zone fin tube system. In the zone I am trying to install them I have fin tube before the ...
jmichas's user avatar
  • 123
0 votes
1 answer
102 views

What is this gray hydronic tubing and how should I work with it?

I purchased a house (built in California in 1994) with radiant hydronic floors. This tubing comes from the floors in the utility room and it appears to be using compression fittings to connect to the ...
Matthew's user avatar
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-1 votes
1 answer
100 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 ...
mreff555's user avatar
  • 1,287
1 vote
1 answer
101 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 ...
Meg's user avatar
  • 11
1 vote
0 answers
2k 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 ...
Oliver's user avatar
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1 vote
0 answers
55 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 ...
k239430's user avatar
  • 11
2 votes
5 answers
1k 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 ...
mr blint's user avatar
  • 1,840
2 votes
1 answer
232 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 ...
Jeremy Coxon's user avatar
0 votes
1 answer
102 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 ...
M Laird's user avatar
0 votes
1 answer
172 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 ...
AA040371's user avatar
  • 453
1 vote
0 answers
2k 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 ...
StayOnTarget's user avatar
  • 5,585
2 votes
1 answer
1k 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 ...
StayOnTarget's user avatar
  • 5,585
0 votes
3 answers
406 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 ...
Nick Nack's user avatar
0 votes
1 answer
412 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. ...
Phill Apley's user avatar
1 vote
1 answer
459 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 ...
QueueHammer's user avatar
0 votes
1 answer
66 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 ...
Yu Zhang's user avatar
  • 169
2 votes
2 answers
397 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,...
TomG's user avatar
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0 votes
1 answer
2k 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, ...
Adirondack Jim's user avatar
1 vote
1 answer
335 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 ...
astoffel's user avatar
1 vote
1 answer
92 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 ...
cyclops's user avatar
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0 votes
1 answer
1k 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 ...
Matt's user avatar
  • 9
1 vote
0 answers
46 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 ...
QueueHammer's user avatar
-1 votes
3 answers
117 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 ...
DonBoitnott's user avatar
2 votes
1 answer
619 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 ...
Katidid's user avatar
  • 51
2 votes
3 answers
6k 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 ...
rajan's user avatar
  • 203
1 vote
2 answers
787 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. ...
n8.'s user avatar
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