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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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Can a C wire be added to an old Teledyne Laars JVT-100C boiler?

Good morning. I have an old Teledyne Laars JVT-100C Boiler, that only has R,W,A terminals. is there a way to add a C wire to this boiler in order to power my thermostats? Thanks in advance...
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How do I know when a water heater's relief valve should be replaced?

My relief valve has been leaking lately. It looks like its not working right. How do know when its not working right? Its leaking from the end of the pipe the spring seems like its not working right
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Oil Boiler - Pressure Valve leaking even after replacing Expansion tank

my oil boiler has a mawp of 30 psi and the old expansion tank was 18 psi rated, when i started noticing that pressure relief valve has started leaking 2 gallons a day, i notice the expansion tank had ...
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38 views

Radiators no longer heating up after cold weather

I have a Worcestor Danesmoor boiler that lives in a stone outhouse and heats the water and radiators in my house. The heating is set to come on at certain times of day, but during some recent cold ...
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Combi boiler pressure drop - even after expansion vessel has been emptied and recharged

Recently had an issue with my ~5 year old Baxi Platinum HE 24 combi boiler. Pressure had dropped and needed topping back up 3 times a day to retain pressure and not get any errors. Got a heating ...
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54 views

C-wire on Weil-McLain CGA Series 2

I have an old thermostat with only 2 wires connected to my Weil-McLain CGA Series 2 boiler. I would like to replace it with a Nest thermostat. I need to add a C-Wire in order for it to work. Luckily, ...
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61 views

Can't get wifi thermostat to work with gas boiler

I bought a Sensi WiFi thermostat and I have been trying to install it. I can't quite figure out how this wiring should work. Here is a link to pictures of the boiler and the current thermostat. The ...
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33 views

How to connect c-wire to Burnham Series 2 boiler?

I am trying to install my ecobee 3 light but the previous thermostat did not use any c wire. Fortunately, there was an unused wire in the wall and I would like to set it up as a c-wire. The problem is ...
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30 views

Leak in boiler system

Have concrete slabs heated with an HTP boiler. 4 manifolds (2 supply, 2 return w/shutoffs). Had a loss of pressure and low water pressure error on boiler. I have isolated the leaks off the manifolds. ...
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23 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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38 views

Zone Controller T-Stat Wiring w/ 24V transformer, isolation relays for 2 zones

I have a new Navien SmartZone+ 6-Zone Control for my boiler-based heating system. It is great, except it provides no power on C. I realize the internet has researched the heck out of adding a C ...
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Valiant Boiler - 3 months old

In September I had a Valiant boiler fitted in my 2 bedroom house. It hasn’t worked properly ever since. Every time I put the heating on my pressure drops from 1.5 to 0.3 bars and I get the spanner ...
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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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52 views

Glow Worm Flexicom HX boiler F11, F22, F25 Error codes

This is less of a question, but more of a list of things we tried to stop the frequent F11, F22 and F25 error codes appearing on our Glow Worm Flexicom HX boiler which would stop it from functioning. ...
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44 views

Hot water (steam?) gas boiler not engaging burners, low pressure, sight glass full

At the beginning of the winter season my boiler wasn't turning on, but I got it to work by turning on the inlet valve and just letting it feed water until the gas burners kicked in. The sight glass ...
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151 views

What kind of tubing should I use for draining condensate from a furnace / boiler?

"High efficiency" & condensing boilers or furnaces produce an acidic water byproduct called condensate that has to be drained away. My boiler has an outlet fitting for this condensate water but ...
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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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24 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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36 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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26 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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9 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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32 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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119 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
156 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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2answers
74 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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1answer
19 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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36 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
91 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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59 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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44 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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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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67 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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2answers
40 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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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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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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344 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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59 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
29 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
73 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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104 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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22 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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75 views

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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60 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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25 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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178 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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96 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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481 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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523 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 ...