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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Odd noise from boiler and lockouts

Can anyone tell me what the noise is from my boiler at just before 6 seconds when the boiler fails to light and again at about 25 seconds when it does light successfully. Boiler noise video It sounds ...
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Can I replace one hot water radiator with electric underfloor heat?

My home in NJ, USA uses has gas-fired hot water radiators for heat. I am renovating the bathroom and will be adding underfloor heat. The bathroom has a radiator that I'd like to eliminate. I don't ...
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Why is my boiler leaking?

We noticed our boiler leaking today. It seems it is coming from the overflow of our expansion tank. Can anyone offer any assistance as to why this could be happening? To our knowledge, this has not ...
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What is this box attached to the back of the house?

The house was constructed around 2000. I can't find any kind of identifying markings, and it's in the back of the house above the boiler (not near any incoming utilities which are in the front). It'...
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Two transformers connected to boiler, no A/C

My HBSmith boiler honeywell circuit box has a 2-wire from transformer to the thermostat. Then there is another transformer on the ceiling that has conduit to the same circuit box, but different ...
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Can you use a tankless combi boiler ONLY for central heating?

We're looking into replacing our boiler. The current one is tankless and only provides hot water for heating on a closed loop. There is an entirely separate electric HW tank & plumbing for '...
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Is primary/secondary system the right setup for condensing boiler?

Recently we've just installed Lochinvar NKC199N by a local contractor here, using liquid propane. Since this is a condensing combi-boiler, I understand that it will be running up to 95% efficient when ...
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Viessmann Vitodens 333-F set Temperature is stuck at 5 °C

My Viessmann Vitodens 333-F does not start the gas burner automatically. Here is what I checked so far after logging in with viservice for the service menu and viexpert for the parameter Level 2 menu. ...
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Why does my boiler inlet pull hot water from the outlet?

Last month we installed a Lochinvar NKC199N, using LP Gas. Attached is a picture here for the reference. We have 4 zones, but let's forget about the other 3 zones as I am having issue with one zone ...
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Does this sound like a bad bearing on the blower fan? (burner of oil-powered boiler)

There are a number posts about whining sounds, but it's hard to know if the posters are talking about the same kind of sound I'm hearing. It's coming from the burner of our oil-powered boiler but I ...
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Adjusting water heater that provides both domestic hot water and baseboard heat

I live in an apartment building with in-unit water heaters. Mine is a Weil-McClain Gold CGt gas-fired water boiler with tankless heater. It heats water for domestic use and also for my baseboard ...
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How to get the C wire for Nest thermostat on Burnham series 2 gas boiler

I am trying to setup a smart thermostat for my boiler. Can you help me see where I can extract the C wire out from my boiler. Thanks
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Upstairs heating zone wont turn off

I have two zones in my house, upstairs & downstairs. Baseboard heat/ boiler/ propane. I noticed that regardless of the thermostat reading (nonprogrammable circle honeywell heat only) i can feel ...
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Condensing boiler outlet temperature for floor radiant

We've just installed a new Condensing Combi boiler last week, Lochinvar NKC199N. I've noticed the installer set the outlet temperature to 180F/82C and the return temperature to inlet is somewhere ...
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Where do I put the capacitor for and old Worcester Ri boiler thats affected by a 3 port Honeywell valve

I got the capacitor mentioned here and fitted it on ST1 Neutral and ST2 SWL, but when I switched the boiler back on I got nothing. No blue light. Removing the capacitor it fired straight back up. Am I ...
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What is causing leak at my boiler through pressure relief valve?

Recently my boiler is leaking periodically through the pressure relief valve. I replaced with a new pressure relief valve. Still leaking so I hired a plumber he said my expansion tank is filled with ...
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One of multiple zones calls for heat, but all return lines get hot

We just installed new gas combi boiler (Lochinvar NKC199N), it is working but there is one issue that I don't quite understand. We have 4 zones (4 different circulation pumps, 4 thermostats), when ...
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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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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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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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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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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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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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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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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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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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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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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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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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2 answers
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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3 votes
1 answer
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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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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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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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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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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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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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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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