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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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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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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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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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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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
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
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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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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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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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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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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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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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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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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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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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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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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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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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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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
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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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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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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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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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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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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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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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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1answer
72 views

Boiler turns on briefly throughout the night

We moved house a few months ago and our property either has the same or a very similar boiler to our old house. It's a condensing boiler, a Worcester Greenstar 37cdi and the controls look identical. ...
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33 views

Should condensate pipe go below vent and how?

Need to lay condensate pipe from the boiler room to the waste pipe, on the other side of my flat. Will use condensate pump and use loft as proxy. I want to drill through ceiling from my boiler storage ...
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455 views

Hive Wiring Advice - Combi Boiler

I've just moved house and am trying to wire up the hive (as I did in my previous house with no problems). I have a combi boiler (Ideal Logic 30) and a single-channel hive receiver. The old thermostat (...
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1answer
76 views

I think my gas boiler flue looks off

We had a gas boiler installed. The registered installer did not highlight any issues with fitting the boiler before fitting it. I was away when the job was done and now there is a "snorkel" ...
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38 views

Trying to wire a nest thermostat E in UK with 2 live wire and 2 neutrals

I live in the UK and am trying to replace a Honeywell WiFi thermostat with a Google Nest thermostat E. I have 2 3-core wires coming into my thermostat, 2 live and 2 neutral wires, 1 pair I believe are ...
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52 views

Can I build a small basement under wood cabin and add an electrical boiler 30L for shower and sink?

Can I build a small basement under wood cabin and add an electrical boiler 30L (e.g. Ariston Andris) for shower and sink that would be at ground floor?
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83 views

Can't get boiler to stop heating! It's 80 degrees in the house

I have two boiler systems. One for the heating of the house, and one for sink/shower hot water. The boiler for the house will not turn off! It does kick on and off for a duration of time like it ...
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31 views

How to further troubleshoot a problem with my condensate pump?

During a recent trip to be basement I noticed that the floor was wet under my condensate pump. This pump collects the water from my water heater but it's powered through my boiler. There was a lot of ...
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21 views

Is there a way to relieve the pressure on a model 30 expansion tank without draining the system?

I want to change my Xtrol model 30 expansion tank on my boiler. It is not waterlogged but 15 years old and I'm getting ready to sell the house. Plus the pressure has been going a little higher than ...
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2answers
227 views

Why do some multi-zone heating systems have multiple circulators?

In a lot of photos I've seen here and elsewhere of hot water home heating systems with multiple zones, each zone has its own circulator. In my two-zone system there is one circulator, with a zone ...
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2answers
112 views

Can I have independent heating zones with a standard boiler?

We have a new standard gas boiler in our home along with two thermostats, one for the basement and one for the rest of the house (living room, bedrooms, etc). The problem we're having is that the ...
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44 views

How do I test and maintain the expansion tank on my boiler?

I don’t know what maintenance or adjustments are possible on an expansion tank. I understand from the answer to this question that it needs to be "pre charged" to accommodate the range of ...
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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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104 views

C-wire nest to burnham boiler

Connecting nest learning 3rd gen to burnham series 2 model 203 boiler. I am only using the system for heat. I have three wires at the thermostat R,W and an unused green that I would like to turn ...
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1answer
201 views

How do a boiler’s autofill valve and expansion tank work together as a system?

How do the expansion tank and automatic fill / reducing valve work together in a hot water heating system? It seems to me that if the expansion tank is charged too high the autofill valve will never ...
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72 views

Does this boiler flame look ok?

This is my natural gas hot water heating boiler flame. It lights up initially with a fair bit of orange flame, and after 10 seconds or so settles into what's pictured. I believe it mostly looks as ...

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