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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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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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17 views

Hydronic Heating and DHW on boiler

I have Triple AQUASTAT relay L8124A Honeywell controller on my hydronic heating boiler. It is setup like this for hot water heater as well. I don't have use it for hot water, I have electric hot ...
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19 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
16 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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31 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
55 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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1answer
52 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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12 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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17 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
51 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
32 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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36 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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34 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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1k views

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
111 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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24 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
25 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
61 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
100 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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20 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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25 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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1answer
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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15 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
81 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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1answer
69 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
288 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
246 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
133 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
252 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
54 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
30 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
76 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
119 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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310 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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27 views

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
4k 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
496 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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1answer
94 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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1answer
35 views

Do I need to prepare my boiler for the water being shut off at mains?

We have a brand new boiler and hot water heater. The city is turning our water off at the main for approximately 6+ hours for maintenance. Do I have to do anything? They’re both run on natural gas. ...
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16 views

How compatible are remote-controlled thermostats?

I currently have an aging Honeywell thermostat system (CM927 user control unit with a BDR91 relay). The control unit is starting to have issues (fading LCD screen, not a battery issue) : I'm ...
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1answer
83 views

What is this black device on the wall of the furnace/boiler room?

I've seen these in various places in the past and I'm wondering if anyone knows what the function of it is. There appear to be large resistors along the sides of the device and an odd round knob in ...
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204 views

Slant/Fin Victory II Boiler - How do I turn on?

This summer, we moved into a home that has sub-floor heating installed. However, I have no idea how to use the boiler or turn it on. The boiler itself (a Slant/Finn Victory II gas-fired boiler) has ...
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89 views

Combi boiler “Heating Return” valve - pressure dropped

I have a Potterton Promax Combi HE Plus boiler. Yesterday I tried to repressurise the system to prepare for winter. We have a refilling loop under the sink that I have to open and the water from the ...
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2answers
76 views

Central heating system / boiler does not shut off

I'm hoping someone here can help with a mysterious fault with our central heating system, which sometimes gets stuck and runs all day even when the timer is off. It's a standard (for the UK) low-...
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1answer
201 views

Is the control wiring for my boiler reversed?

I've been diagramming my boiler wiring so that I can understand it before installing a Tekmar 256 external reset. What's been throwing me for a loop is that it looks as if the 24v common is being fed ...
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0answers
77 views

Combi boiler on 2nd or higher floor - how to tell if water flow and pressure is sufficient?

The combination boiler in my house has to be moved, and one idea is to put it in the loft space to free up a decent amount of space in the main part of the house. The house isn't big, so this would be ...
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0answers
72 views

Strange Pin Pierced Pipe in Boiler

Just wondering if anyone had any ideas on this? I put the central heating on for the first time in about 6 month the other day. The radiators did not get hot and within a few minutes the boiler ...
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1answer
83 views

How do combi boilers with built-in hot water tanks work?

A number of combi boilers on the market in the UK have small (approx. 20 litres) internal hot-water tanks. These boilers are commonly marketed as being suitable for households with high hot-water ...
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1answer
29 views

The safety valve on boiler is really noisy

I have this safety valve installed on cold water inlet of my boiler/water heater. When I turn on hot water tap but keep it around 30%-50% open this valve produces really loud noise, which travels ...
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1answer
157 views

Purpose of hot water tank and boiler

What is the purpose of the hot water tank and boiler when it comes to a) heating and b) drinking water. When I switch on my boiler (not combi) for both heating and drinking water, I see a flame lit ...