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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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What should I do before leaving my house for the winter?

I have a house in the northeast and will be leaving it vacant for a while. In the past I have usually just left the heat on at a reasonable temp, maybe a little higher (62F) because I’d rather spend ...
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35 views

Would replacing my boiler's control board resolve intermittent issues after a water leak?

My Potterton Suprima HE 60 is approaching 10 years old. A few years ago it went badly wrong because the metal flue had corroded (known design flaw) and condensate had dripped down through the boiler. ...
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20 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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19 views

Mystifying boiler control circuit

I have had a few issues recently with an electrical boiler and I have replaced a few electrical parts (relays, time delay switches,...) to keep it running. Doing so, I noticed that the internal ...
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Furnace intermittently tripping

My primary will trip everyday or so but once I hit the reset button it runs fine by getting up to temp and turning off and on via the thermostat as it should but then it will trip again and I have to ...
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1answer
22 views

Will a Gledhill Boilermate 2000 work with a Honeywell Evohome thermostat?

Our flat uses a communal CHP system, with a Gledhill Boilermate 2000 in our flat (i.e. we don't have direct access to a gas boiler). We're looking to set up a Honeywell Evohome system consisting of a ...
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1answer
17 views

Multiple boilers, one expansion tank and fill mechanism?

For a building with two boilers serving separate apartments, I'd like to simplify my design by having only one auto-fill and backflow preventer, and only one expansion tank. These are combi boilers ...
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6 views

Boiler not modulating when using DHW

My combi boiler when I'm using DHW is behaving on/off (making annoying fluctuations in DHW temperature) but modulates when I run my heating system. What's wrong with it? My boiler is a Hermann (now ...
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1answer
26 views

Leak from valve on boiler - what should I do?

I have this valve which we use on the boiler to increase the pressure but it has just started leaking and is dripping through our ceiling. Can anyone suggest what I need to do to stop the leak?
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1answer
45 views

Sizing a circulator pump in a closed loop heating system with multiple zones

I'm thinking through an install of a new combination boiler in my house, and am confused with respect to picking the correct size circulator pump. I've found a few different references (e.g. https://...
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3answers
80 views

How do I bleed a noisy radiant heat system?

I have a gas fueled (converted from oil just a few years ago) boiler in my basement with an integrated tank-less water heating system for the showers/taps/etc. The output is three zones as shown in ...
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24 views

C wire for old boiler

https://imgur.com/a/vXITXuk This question has come up in various similar ways, here and elsewhere. I don't think I've missed the answer for this case in those scenarios. What I did find was that the ...
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71 views

Can I reverse my heating zone?

I have a three zone hot water boiler based heating system. The boiler is currently at one end of my ranch style house. The radiators appear to be directionless (no valves or anything). One of the ...
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Do I need to replace the thermostat wiring leading to my boiler?

I have a boiler in an old building with four different apartments. There are two thermostats that call for heat from the boiler, and valves that direct the hot water to the respective part of the ...
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26 views

Expansion tank banging and gauge fluctuations

My expansion tank went so I replaced the tank and Pressure Relief Valve and bled the system. The problem now is the new expansion tank starts thumping and banging and the pressure gauge fluctuates. ...
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1answer
18 views

Customizable boiler water load

I need a boiler to produce hot water for my bathroom. I wonder why boilers usually don't let you customize how much water they should contain. I only need to warm up 80 litres if there are guests in ...
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33 views

Gas line addition to external building - can I avoid expanding all existing lines?

I'm adding an external building with hydronic heating and a variable boiler (160k BTU max) which will be about a 100' feet from the existing gas meter. I had planned to simply tap into the existing ...
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2answers
64 views

Can i get electrocuted with boiler

I just got my new electric Bosch boiler because my old one has been making strange noises, now im a little bit scared.. can i get electrocuted trough water while im showering..should i turn it off ...
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57 views

Water is coming out from shower hose every time I use water in any part of my house

The shower water seem to have a life of it’s own.It is not stopping regardless. When using the sink or washing machine, even the kitchen sink, the shower stream changes dynamicly with a pumping sound. ...
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26 views

Re-light pilot on Potterton Performa 30 HE

We had the gas main cut off for a few hours, it's back now but our Potterton Performa 30 HE won't come back on. I'd guess that the pilot light's gone out but have no idea how to re-light it. I get ...
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31 views

How to refill water pressure in this Ariston ecombi boiler?

I left my house on vacation and when I returned, my Ariston ecombi boiler is no longer working. The error code indicates that the pressure needs refilling. I have been here before and I remember ...
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1answer
59 views

Condenser is always running

I recently rewired two thermostats into one Honeywell RTH9580WF1005 Wifi Thermostat. I ran a new wire and hooked up R and W to the oil boiler and Rc, C, G, and Y to the Goodman air handler. The Y is ...
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33 views

Separate or combined boiler and hot water heater

I'm looking to replace my boiler and hot water heater. For background, I live near Boston, my home is about 2000 square feet, we have gas for heat, stove, and dryer, and we are two people in the ...
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56 views

Condensate Neutralizer Refill

For a tankless water heater and whole house boiler there is a neutralizer installed in my boiler room. It has not been refilled in more than a year. After some research I found out that I should use ...
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38 views

What are the black taps for on my combination boiler?

I can re-pressurize my Baxi combination boiler using the two blue taps and watching the pressure gauge but, solely out of interest, what are the two black taps behind the gauge for?
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Ariston boiler with 108 error code

I have an Aniston gas boiler. It's displaying error code 108. After Googling I found it's because of the low water pressure. Other forums indicate I should open the water valves underneath until the ...
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1answer
194 views

Repressurising baxi duo tec 2 28ga combi boiler?

I have a towel radiator that really needs bleeding however I'm concerned that my boiler is going to need repressurising after bleeding. Most tutorials I have seen have had 2 blue taps that you need to ...
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39 views

Peerless Boiler not heating - No flame

I have a Peerless boiler and today woke up to it not heating the water. The water definitely feels like it is circulating through the pipes, but the water temp isn't getting over 60 degrees. We had it ...
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2answers
27 views

Boiler Combi 24 pressure indicator always point to 0

I have a Boiler Combi 24 (UK) and this morning I just noticed that the pressure indicator is pointing to 0. However everything is working fine, I have heating and hot water. Usually when the ...
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2answers
65 views

What's the effect of introducing bends into a primary-secondary heating loop?

I've been learning about primary-secondary boiler systems for my home, and have landed on a two-boiler system (two apartments), very much like Siegenthaler describes in his illuminating book and here ...
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1answer
101 views

Metallic smell when HVAC Unit. fires up. What could it be?

Background: The HVAC unit I have serves both the 1st and second floor, but does a poor job of distributing heat to the 1st floor. The previous owner added a hydrodronic boiler and baseboards to the ...
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21 views

New (combi) boiler: should I go for integrated or detached hot water thank

I got some estimates for a new boiler, price is almost the same, but one comes 'split' in two: the 'burner' on one side (that includes the 3-way) and a 80L thank. Other is a 'combi' that has both ...
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Radiators hot upstairs, stone cold downstairs

I'm looking for some advice on my central heating. We moved into a house with an 'Exclusive ProCombi 24' boiler about a year ago, and it's been working well up until 2 days ago. Some radiators were ...
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59 views

17 years old tankless, fix or replace?

I have a 17 years old conventional tankless combi boiler, it has a 'spilling' 3-way and DHW exchanger clogged by limestone. Should I fix it or I'd do better replacing the whole boiler with a new ...
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20 views

Boiler no longer has the pressure to heat rads

I had a question here about no being able to repressurise my Logic Combi 24 boiler, which got resolved. I got a guy out to look at the boiler and he said the last man to work on it(the one who ...
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1answer
125 views

What is the effective difference between an inline air separator vs a air vent at the high point in a recirculating water system?

My tankless water heater manual suggested the recirculating set up shown here: It appears there are 2 air vents, but one is attached to an air separator. Do I need both an air vent upstream of ...
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75 views

My boiler's gas burner tube is catching fire, how do I fix this?

About 1 or 2 times a week I hear a roaring flame when my boiler tuns on. I've check on it and it appears one of the boiler gas burner tubes is internally on fire (see video I took of it). What is ...
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1answer
387 views

Nest E thermostat on ancient 2-wire Bryant boiler system with 2 zonesq

I have a 2-zone hydronic system running off an ancient Bryant boiler. Power is supplied by a 24V transformer, and each red wire passes through a Taco zone valve before heading off to the appropriate ...
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2answers
387 views

Do I need separate expansion tanks for my boiler and hot water heater?

My hot water tank went and I'm trying to replace it with a tankless system, but the old water heater did not have an expansion tank installed with it. In my previous house I had a combination unit ...
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3answers
222 views

Is it normal for my boiler transformer to show intermittent drops in voltage?

Since I installed a Nest-E I've seen my Weil-McLain boiler cut power to the R-wire and C-wire intermittently. Voltage drops to nearly 0 and the Nest-E errors with E-195 no power. Other times ...
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1answer
422 views

Boiler backflow preventer leaking

Our boiler's backflow preventer valve started to leak out of the vent around Thanksgiving. I read that it may have to do with system pressure and it may stop, which did stop dripping after a few days. ...
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1answer
59 views

What are these controls attached to my boiler for?

If it matters, I live in Ireland. We have an oil boiler powering a two zone hot water radiator heating system and a separate electric hot water tank for tap water. Outside our house in the corner of ...
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1answer
31 views

Water boiler system keeps freezing

In my house the ground floor (not basement) heater zone is freezing and pipes are breaking. Apparently this is because we run the wood-stove, and it keeps the thermal sensor high so the boiler won't ...
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2answers
100 views

Why would furnace not come on immediately?

I had a brief scare just now. It is 7-degrees right now and getting colder so I definitely don't want a furnace failure. I came home and house was at 62 with thermostat at 64 (my standard not-at-home ...
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2answers
156 views

Boiler losing pressure only when central heating is on, and only a little, leak?

I have a MAIN 30 HE boiler and it loses pressure when the heating is on, seems to be fine and no loss of pressure if the heating is not on or only use hot water. Would this indicate a leak somewhere, ...
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1k views

One zone of baseboard heating not working, likely airlocked

Pretty sure I've got this, but would like confirmation. One zone of 4 on my boiler is not putting out heat. Gas company came out, gave boiler, valves etc. the thumbs up and say they believe the line ...
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my burnham boiler wont ignite

Igniter is good tested that. I'm only getting 7 vac out of smart valve( i know that isnt enough for the igniter). what i need to know is is the gas valve bad or is something telling it not send the 24 ...
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1answer
8k views

Nest thermostat not turning on heat

I have an old gas furnace/boiler for hot water baseboard heat and I'm trying to switch from a 2 wire mercury bulb thermostat to a Nest Thermostat "E" (the new white faced one). There are 5 wires in ...
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1answer
715 views

Mini-split vs gas boiler for heating

I recently had three mini-split heads installed, two downstairs and one upstairs, primarily for A/C. These are Mitsubishi units, rated down to -15C (or perhaps F, but it doesn't really matter for my ...
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128 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 ...