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Questions tagged [radiant-heating]

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1answer
18 views

In floor heating GFCI thermostat failure?

Fifteen years ago, a contractor installed Easy Floor heating system under tiles in our lower level. There are four GFCI programmable thermostats wired to 240v service. About five months ago, one of ...
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2answers
36 views

Is there harm in using my mini-splits in conjunction with my hot-water baseboard heat?

My new house has a natural gas boiler with three zones of radiant baseboard heat (one per floor). It also has a mini-split system (again one head per floor). The mini-split was advertised as air ...
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2answers
40 views

Using a Radiator Space Heater to Support HVAC system

I'm looking for ways to heat my home up more efficiently. I live in a 1200 sqft home that sits on the first floor and partially in the ground. So, it gets pretty cold. I was thinking of getting a ...
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2answers
54 views

Insulating basement - foam walls or pour floor first?

Basement is unfinished, 100 year old house. Basement floor is dirt and various crumbling sections of old concrete. Walls are rubble and cement and above grade brick. I'm planning on leveling the ...
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1answer
26 views

Least invasive way to find foundation footings under basement slab?

For a 100-year-old brick house (two-flat) in Chicago, I'd like to find my foundation footings so that I can plan in-floor heating. What's the least invasive way to do so? I'm imagining drilling ...
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1answer
264 views

In-floor radiant heating hooked up to hot water tank in new home - questions about how it works and operating it

I've moved into a new 2 story house. The heating system is in-floor water heating, and the heat source is an electric hot water tank. I'm hoping you guys can help me figure out how the system works ...
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0answers
97 views

how to replace a tile floor over radiant heat

I just purchased a home and the kitchen has radiant heated porcelain tile floor in the kitchen. The floor is in rough shape so Id like to redo it. This raises a number of questions. should I try to ...
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2answers
42 views

Replace radiator mains and reduce electrical consumption

I have recently converted from oil to gas in my 2500 sqft 1930s era Home. We have a hot water radiator system. We left the original radiator main pipes and risers. They are large pipes 3” mains. and ...
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2answers
55 views

Is this a “fill” valve and how do I use it?

Is the valve in the picture a fill valve? And if so, does its use require loosening the screw at the top?
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0answers
158 views

Can Zurn oxygen barrier pex radiant heating pipe be used for potable water?

Is it safe to use some oxygen barrier Zurn hydronic heating pipe for potable water?
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1answer
241 views

Is Kerabond T with additive okay for under Ditra Heat?

I'm looking to install porcelain tile over Ditra heat mat in our kitchen. From what I read you need to use a modified thinset for under the ditra mat(over plywood subfloor), and unmodified for over ...
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0answers
318 views

NEST thermostat for hydronic floor heating: the three wire setup

I'm trying to install a 2nd generation Nest thermostat for my hydronic floors. So it's only meant for heating and not for cooling. Someone else removed the old thermostat a long time ago so I don't ...
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0answers
61 views

Is it a bad idea to disconnect the my radiator fan?

The fan that circulates air through a radiator in the apartment I rent is very loud and my landlord doesn't want to replace it. He gave me permission to disconnect the fan. I think this makes it ...
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1answer
244 views

Connecting a thermostat to air handler and cast iron boiler

I have a 4 zone system. I want to put 4 new thermostats on the system. I wish I looked at the wires before I removed them all! So dumb. Anyway.. There is an air handler in the attic. A compressor ...
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1answer
227 views

Converting Diverter-Tee System to Loop

I have an old house (~130 years) that has a hydronic baseboard system installed. The heating system is improperly plumbed: the 1st floor thermostat controls half the heating on the first floor and ...
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1answer
387 views

Hydronic radiant heat in ceiling

I am looking to retrofit a hydronic radiant heating system to the first (ground floor and basement of my house. For the first floor the plan is to install the system under the subfloor by snaking the ...
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0answers
27 views

What is the max wattage per sqft for heat floor wires?

I am wanting to use electric floor heating as my primary source of heat for a room we are remodeling. My question is can I use more than 15 watts per sqft and still be within national building code ...
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0answers
90 views

Hydronic Ceiling Radiant

I am looking to install radiant heating in my single-family house (300 sq. ft.), and I am primarily interested in hydronic radiant because my calculated heat loss is likely around 10kBTU/hr, which is ...
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1answer
1k views

Insulate Floor with No Crawlspace Access

As a corollary to my other question on insulating existing walls, I am also interested in insulating my floors. Right now, only about half of the 300 sq. ft. has its "final" flooring completed. We ...
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0answers
88 views

Is it possible to wire an electric radiant floor as a heat pump in my Nest thermostat?

I have a standard gas furnace, but recently installed an electric radiant floor in one room. I have a transformer at the electric floor and a regular low voltage thermostat wire to my Nest thermostat. ...
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0answers
608 views

Can self leveling compound be used over a thin foam underlayment?

I recently purchased this underlayment to use with radiant floor mats over an existing concrete slab. I had not planned on using a self leveling compound but I've come to the conclusion that even ...
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3answers
2k views

Where to place a radiator under a window seat?

I have a bay window in which I want to build a window seat like this: However, a radiator is currently attached to the wall underneath the windows, with a radiator cover (the typical board with ...
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0answers
90 views

Finding the copper pipes the radiant floor heating converges

I'm trying to troubleshoot our central heating system in our residential house. Our house was built around the 90s and I've found that we use Radiant Floor Heating. The plans I've obtained from the ...
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0answers
104 views

Tankless Recirculation Loop as Hydronic Radiant Heating

While researching ways to heat a small bathroom (28sq. ft. total), I came across a post that someone put some narrow piping above a bathroom subfloor and cemented it in under the tiling. They were ...
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2answers
828 views

Help wiring a Nest thermostat in an unusual situation

The attached picture shows my current wiring. Notice there are two thermostats. The top one (Carrier, with four conductors) controls hot air heating. The bottom one (with two conductors, old mercurty ...
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1answer
293 views

How would I install hydronic floor heat on top of a rigid foam insulated basement floor?

I intend to finish a part of my basement following this guideline from Fine Homebuilding and Building Science. There are two options I could come up with for installing hydronic radiant heat ...
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1answer
39 views

Excess Heat in Basement Unit

I live in a basement unit in an old building. There are steam pipes that are running through above my ceiling and these are what's causing the excess heat. Because it's an old building, I'm sure the ...
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1answer
68 views

Least Destructive New Heating System? Hot Water or Air?

I'm having some issues with my current steam heating system. I'd rather get it replaced with a whole new system, either forced hot water or forced air. The house was built in 1916, so I'd have to do ...
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0answers
25 views

Joist trak radiant tube length in last bay

I'm installing my first radiant floor system using 1/2 inch tubing and Joist Trak plates. I purchased a 1000 foot roll of tubing and cut it into 5 200' pieces. While running my loops, I'm finding ...
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2answers
2k views

What is the impact of a backwards connected hot water radiator?

When building a hot water heating system the plumber has connected one of the hot water radiators backwards, i.e., the loop comes in at the bottom of the radiator and leaves the radiator on the other ...
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2answers
1k views

Old radiant heat ceiling not cooperating, looking for ways to fix it myself

So I came home today to find my living room at over 80f degrees. My thermostat still correctly showed my base temp at 70f, but the room temp was through the roof and the ceiling heat was still going ...
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0answers
63 views

How to insulate under hot water radiant flooring over a crawlspace?

I just built a small extension on my wood frame house. We are in the northeast (winters down to the low teens). We added three small rooms (mudroom, laundry, bath). They all now have hot water ...
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1answer
543 views

Downsides to staple up radiant heat, besides cost?

I'm considering doing a radiant heat retrofit into my home and removing an older forced air system. The plumber is proposing a staple up from the basement into aluminum plates with PEX tubing with a ...
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1answer
333 views

Retrofitting floor radiant heating under hardwood floors

I am considering retrofitting radiant floor heating into the first floor in my home by attaching the pex to the bottom side of the subfloor from the basement. On the top side of the subfloors is some ...
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1answer
67 views

How should I insulate hydronic radiant heating under floorboards

A couple weeks ago a contractor installed hydronic radiant heating at my place. The building is two floors (studio above a garage) and the heating was installed under the floorboards. When he finished ...
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1answer
59 views

Replace portion of slab for radiant heat

Our 1600 SF basement has a slab floor with no insulation underneath. I'm redoing the bathroom (roughly 100 SF, with 7' along the foundation wall) and would love to put in radiant floor heating, but I ...
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2answers
708 views

Should I use Ditra for my slate floor with radiant heat and 2 layers of plywood?

We are putting slate on our main floor, and have radiant heat. We used a second layer of plywood as guides/spacers between the pex loops, rather than concrete over the whole thing to help cut down on ...
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2answers
231 views

Is it feasible to store adequate thermal solar heat overnight?

I'm considering a passive solar radiant heating installation in the Chicago area and was wondering if it would be feasible to store enough water/energy to support heating for most of the night. The ...
0
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1answer
162 views

Does installing electric heated floors require dedicated electrical?

I would like to install electric heated floors throughout a home built in 2008 (In BC, Canada) to replace a forced air furnace system. I am wondering if this project will require running a new set of ...
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3answers
1k views

Is insulation necessary under slab with hydronic radiant heat?

We are getting ready to pour a new concrete slab over top of an old slab where a house was demolished. The old slab is 4-6 inches thick, and the new slab will be 3-4 inches thick. We would like to run ...
2
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1answer
116 views

How would I size a heating system that would only be used to warm the floors?

I have a forced air heating system that works well, and I'm not looking to replace it. However, I'd like to get the "warm floors" effect of radiant floor heating. I've heard that with a lot less BTU/...
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2answers
71 views

can i safely turn on my heat with my water not turned on in my house

i just moved into a hous3e and my water wont be turned on until next week but its cold in my house. I was wondering is it safe to turn my heat on. i have radiator heaters and i think they run off ...
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1answer
139 views

Changing radiators to radiant wall heating

In my bedroom/study I have only a radiator as heating. The problem is that the water flow is controlled by the thermostat in the living. This means that around wintertime my room has a big change in ...
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3answers
12k views

Why is one bedroom colder than the rest of the house?

I had a home built last year and we have one bedroom that is 6-10 degrees colder than the rest of the rooms in the house when its cold outside. The heat is radiant and the system has temperature ...
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0answers
858 views

Will porcelain tile provide enough thermal mass for off peak heat storage?

The U.S. department of energy suggests electric radiant heat can be cost effective if preheated during off peak electricity hours if installed within an appropriately massive covering. Is there a way ...
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1answer
238 views

Electric Radiant heating Vs Hydronic - What can I get?

I have a carport that was closed in to become a 3rd bedroom in our house. It has a low ceiling of approx 8 or 9ft. I gutted the whole room so it's down to the slab right now. I'm in the process ...
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2answers
409 views

Radiant heat in ceiling

How do I tell where the radiant wiring or pads, or whatever, is in my ceiling? I want to install overhead cupboards but am afraid of ruining the heating.
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0answers
117 views

Why are some radiators hot when the system is off?

Yesterday I drained my heating system so I could cut the pipes on one radiator to raise it. After refitting, I filled and bled all the radiators and they were all working. When I got up during the ...
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3answers
4k views

Can I run PEX through PVC pipe embedded in a concrete floor with radiant heating?

I'm building a new home in New York State. It will be slab on grade with radiant heat in floor. I'm going to run the domestic water supply (PEX tube) to each bathroom, sinks, toilets etc. in the ...
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1answer
4k views

Best option to fix cracks in ceiling with radiant heat?

One of friends recently purchased a house with electric radiant heat in the ceiling. Several rooms have cracks in the ceiling. Currently they are redoing the kitchen which has a large crack which is ...