Questions tagged [boiler]

The boiler is used in a central heating system to heat water that is pumped through pipes to radiators within the home.

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2answers
273 views

How can I switch a circulation pump between continuous power and thermostat control?

I have a dedicated 20 amp circuit powering my boiler's control unit. The control unit is basically a relay operated by the thermostat that 1) fires the boiler and 2) turns a circulating pump on and ...
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1answer
43 views

Saving energy with wall-mounted boiler and radiators

I have a wall-mounted gas boiler and four radiators around the house in different rooms and locations, and the thermostat is in the living room. I wonder should I close all radiators except the one in ...
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1answer
51 views

How to create a C-Wire from Honeywell R8888A/B

So Ive been trying to install a new Honeywell wi-fi thermostat. I have been unsuccessful in any event. I have a third wire unused at every thermostat in my home which is black. This black wire tuns ...
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19 views

Only unit in condo building with water hammer

This exchange is always helpful. I read a similar post for some ideas, but this situation is slightly different. I have hydronic baseboard heating with a common boiler in the garage under the building....
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2answers
5k views

Apartment boiler system. Very hot water coming out of cold water tap

My family and I live in an apartment. There is very hot water coming out of the cold water taps, and the toilet. I know it's summer so I expect some. In order to get even mildly cool water we have to ...
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1answer
452 views

Where do I connect a C-wire to my electric boiler ( Slant/Fin Monitron Boiler )

I'm looking to add a C-wire for my thermostat. My current thermostat has two wires, W and R. But there is another tucked in blue wire. That blue wire isn't connected to the boiler. I'm looking for ...
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26 views

Adjusting propane/air mix for boiler

Bit of a saga; upshot is that I need to adjust the fuel:air mix in a propane-fired boiler, after I made repairs and put in a brand new, name brand propane valve. What would be a decent exhaust-gas ...
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33 views

Wiring Boiler for a C wire Adapter

I want to install a smart thermostat for one of my boiler zones. My thermostat doesn't have a C wire. It looks like installing an adapter would be the best option, but I am not sure my system is ...
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1answer
91 views

How can I increase boiler system pressure so bleeding 3rd floor radiators is easier?

It is very difficult to bleed air out of my 3rd floor radiators. I need at least 23 pounds according to the gage on the boiler, and ideally closer to 30 (but not too close!), to speed things up. The ...
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2answers
87 views

Boiler flue adapting to chimney vent pipe

I bought a used hydronic boiler at an antique shop to replace my old one. It came with a flue that reduces from 6" at the appliance box to 5" after a draft hood and a vent damper. My ...
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20 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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1answer
299 views

How to connect wifi thermostat with a boiler after cable upgrade?

I have an old battery operated thermostat right now with two wires (18/2) attached to it running to a boiler. No AC, fan, etc.-- just a boiler. I can easily replace the wire with 18/5 one, however I'm ...
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3answers
158 views

How to track energy usage per zone?

I have an old oil boiler with 4 zones, individual zone pumps. I'm trying to track heat usage on a per-zone basis. Would it be possible to simply track how often each zone pump runs and apply their ...
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24 views

What purpose do the extra wires for my boiler thermostat serve?

I am pulling out an existing wood burning boiler, EKO Biomass 40, and replacing it with a Switzer boiler. This boiler will be my primary and I have a secondary oil-burner in my basement. The heating ...
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1answer
67 views

OK to use this C-wire in old boiler for Nest smart thermostat?

I have an old heat-only gas system with radiators, the boiler is a Willaimson-Thermoflo GWA070NS. I'm trying to install a Nest thermostat but only the R and W wires were in use with my old one. There'...
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1answer
55 views

Taco circulator pump capacitor melted

We have a boiler with a Taco circulator pump that was replaced 2 years ago, and the circulator pump recently stopped working. I realized this when two of the three radiators stopped warming up, and I ...
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1answer
103 views

Solder debris in multi zone hot water baseboard boiler heating system blocking valves

I do not know how old the copper piping for the hot water heating system is. We purchased the house in 1977. We replaced the furnace with a Peerless Pinnacle boiler in 2006, included an integrated ...
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23 views

Do steam heat systems need flushing?

Do steam heat systems ever need to be flushed? The last owners & I never did, about 25 years. One pipe steam heat system, 30g peerless oil boiler. Sight glass gets fairly brown within days of ...
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2answers
5k views

Who should I contact to remove an old boiler from my basement?

I had a boiler fire. When I replaced the boiler, I kept the old one around for insurance purposes. Now it's time to get rid of it. It's got a good bit of steel in it, and still has a couple of steel ...
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2answers
43 views

C wire possibly on my boiler/heat pump

Hey so I know this is annoying and asked way too often but the wife wants a WiFi thermostat and of course I don’t have a “c” wire hooked up and there is no “c” terminal on my control board. We have ...
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1answer
126 views

How to connect C-Wire to Weil-McLain Boiler CGa Series 3

I'm trying to install a Nest learning WIFI thermostat to my boiler. However, I'm not sure where to connect the common wire. I've went through multiple posts on this forum but unfortunately wasn't able ...
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1answer
249 views

Boiler heating gauge drops to negative pressure (psi) on cooling

I just moved into a older house (1937) which has a boiler heating system (steam). When the boiler kicks on the gauge barely goes above 0 psi, and after heating the gauge will drop to about negative 5 -...
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1answer
32 views

How to address low flow from a circulating pump

I hired some plumbers to reroute baseboard heating to hug rearranged walls on the second floor (as a part of a bathroom remodel). They drained the system, turned off the heat, and rerouted the pipe. ...
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2answers
1k views

Wiring a C (common) wire to a Triangle Tube Prestige Excellence 110?

Wiring noob here. Can someone give me step-by-step instructions for where and how I should attach a C (common) wire to a Triangle Tube Prestige Excellence 110 boiler for a ecobee3 thermostat? I think ...
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1answer
107 views

What do T, RF and Lost mean in a circuit diagram?

I recently bought a mechanical thermostat to control the house's temperature during the winter. I need to connect it to the house boiler and into the thermostat, so that the device can get power from ...
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2answers
66 views

Pilot light on boiler will light but burners won’t light

We have a very old boiler system (HydroTherm R150) in our 1800’s home. Last year it worked without issue, this year we’re not able to get it started. The pilot light was shut off, I opened the valve ...
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1answer
35 views

Smart Thermostat - Boiler does not have a C terminal. Can I use the TV or T instead

I am trying to install an Amazon smart thermostat but the boiler does not have a C terminal. It has a C1 terminal but I do not think it is the same due to it being connected to the circulator pump (I ...
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1answer
54 views

How can I control my furnace fan from a secondary thermostat?

I have a WaterFurnace geothermal system with upper and lower level zones. I recently added an outdoor wood burner and my issue is that I want to use a secondary stat to run the furnace fan during the ...
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1answer
163 views

Auto air vent above boiler hydronic expansion tank dripping/leaking

I have a boiler + indirect water heater system. Above the boiler on the hot water outlet side there are a water expansion tank and an auto air vent and on the return side there is another auto air ...
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1answer
59 views

How can I test snow melt system sensors?

I bought a place last summer with a hydronic snow melt system. If works when I turn it on manually. How might I test that the sensors are operable in "auto" mode without waiting for a ...
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1answer
344 views

How do you bleed the air out of a Grundfos UPS15-58FC Circulating Pump?

My Grundfos UPS15-58FC has become a bit noisy when operational. Its a part of my heating system and it starts to hum from time to time and this causes the pipe its on to vibrate. I would like to try ...
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22 views

Preparing for steam boiler maintenance

I've just moved into a new house with radiator heat/steam boiler, and there seem to be a few issues (loud banging noises on startup, one radiator leaking). I have a maintenance person coming out next ...
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1answer
50 views

Fast Stat Common Maker Setup on 2 Wire Boiler

I'm trying to wire up my ecobee in a new house that only has 2 thermostat wires (R, W). I bought a Fast Stat, but I'm unsure how to set it up as I have a complicated setup. There are two aquastats (...
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2answers
862 views

Connecting a C-wire to a Burnham Independence Boiler

I would like to install a Sensi thermostat which requires a c-wire. I am planning to run a new thermostat wire, since the old one was 18/2. I am trying to figure out the correct way to wire the c-wire ...
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1answer
101 views

How do I move a hot-water convector?

I have a "breakfast nook" section of my kitchen with a large hot water convector installed along the baseboards of two walls. Because of other elements in the heating system located close ...
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1answer
58 views

Adding a C wire to Lochinvar Boiler - 2 zones

I am trying to connect an ecobee which requires a C wire to my 2 zone heating system - boiler is a brand new Lonchinvar. My current thermostat only has a red and white wire (I have no AC, just heat). ...
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0answers
56 views

Thermostat calling for heat but brand new Taco Zone Switch not opening?

I have a trusty old gas boiler that succeeded at providing baseboard heat to 2 zones for years. I recently had a third zone added. This is a 2-wire, heat-only system. The electrician tried and couldn'...
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1answer
45 views

Recommended pressure in hydronic radiator closed circuit

What is the recommended pressure in a hydronic radiator closed circuit? By "closed" I mean there is a valve to fill it and then it can be closed, after which the circuit is not connected to ...
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1answer
77 views

If I only want to pressurise central heating not hot water should I get a regular boiler or system boiler

My boiler has packed in, the heat exchanger has failed and the consensus is that was due to sludge, gunk in the system, also consensus is would be better to pay a bit more and get a new boiler and ...
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1answer
47 views

What is the purpose of boiler damper?

Gas hydronic boilers usually have a mechanically controlled damper along the way of its ventilation stack, typically near the appliance itself, for proximity of electrical connection. Is their only ...
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0answers
14 views

Hydronic boiler flue ventilation

My gas hydronic boiler is designed (or just specified) to require a draft hood and a damper on its 6" flue. My question is, on a level lower that going by the dictates of the spec, how much less ...
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1answer
25 views

Why does my radiant heater have multiple zone valves?

I have in-floor water radiant heating. There are five zones of varying sizes. In some larger zones there are multiple circulation loops split from the supply and then recombined for the return. I ...
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1answer
36 views

Neutral Wire on Oil Boiler

I am going to help out a friend hook up their nest thermostat and as you might have guessed it's only a 2 wire at the location of the thermostat. Since the cheaper and newer version of the Nest ...
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1answer
65 views

is it okay if heat exchanger's secondary is connected reverse

We bought a house with floor heating, and replaced the old boiler. We installed a Saunier Duval Isofast condens 21 gas burning boiler and an external Zilmet zb190 heat exchanger between the boiler and ...
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1answer
35 views

Hydronic boiler electrical connection

Every hydronic boiler (for radiators) I've seen had a direct wire electrical connection into an adjacent box, meaning disconnection requires electrical work. I would like to my new boiler more ...
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3answers
54 views

Hydronic boiler sharing 20A circuit

I would like to connect my hydronic boiler to a 20A circuit already loaded by a microwave and a range hood. The label on the boiler says it draws LESS THAN 12A. Does this run a risk of overloading ...
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15 views

Pressure testing gas hydronic boiler

I just bought a used gas hydronic boiler at an antique shop. I have not yet installed it and the item is still returnable if dysfunctional. I was wondering if it would be a good idea to pressure test ...
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0answers
13 views

Choice of steel pipe for extending boiler water sockets

I bought a used hydronic boiler at an antique shop and it came with 1-1/4" (can't tell if galvanized or black due to corrosion) steel fittings for water in and out sockets. In extending them for ...
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0answers
156 views

Connect "C" wire on boiler model number 1135-601

I've read several threads here and on the other websites but still can't figure out how to add C wire to my boiler wiring. I would like to replace my old mercury thermostat with Nest E or any other ...
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1answer
439 views

how to connect C wire for ecobee lite to Weil-McLain EG Series-5 gas steam boiler

I want to upgrade from a battery powered Honeywell thermostat to an ecobee3 lite. This is for heat only. My current Honeywell has two wires: Red and White. Missing is the C cable. There are enough ...

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