How do I replace a boiler condensation pipe? [closed]


I ended up calling a plumber and he told me that it was a condensation pipe for the heating system that was corroded and leaking behind the wall. The pipe was supposed to be a return for the condensed water that cools from the radiators and are sent back to the water boiler or furnace... I don't really know whether he said boiler or furnace and forgot to ask him. So I traced the pipe back to the furnace room, I do see the line splitting to both the furnace and the water heater.

Can someone tell me if these pipes typically going to both the furnace and water boiler?

The plumber told me he was going to replace the pipe that runs along one side of the wall. According to him, there are two condensation pipes that run along two sides of the wall of my house. I can see both of them and both are very old and rusted/falling apart. However he said he would only change the leaking one.

I hope someone can tell me if I would be able to do this job myself. Seems like I...

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Frozen boiler condensate pipes can be a frequent occurrence for UK homeowners during the icy winter months. Ideally you should have the condensate pipe thawed-out by an engineer, but if that’s not convenient then here are some easy guidelines to try to remedy the problem yourself.


What is the boiler condensate pipe?

Most modern boilers have a condensate pipe which transports water away from the boiler. To improve efficiency, the boiler removes as much energy from the flues gases as possible and some of this waste gas cools and turns into a small amount of acidic water. The pipe transports this steady dribble of water away from the boiler and into a drain.

To check if your boiler does have a condensate pipe, look underneath the boiler at the pipes entering and exiting the unit itself. If one of these pipes in plastic (usually white and around 20mm wide) and the rest are metal then you almost certainly have a condense pipe. Track the pipe...

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If you are running a steam boiler system in your facility, you should be treating your system’s condensate to ensure system longevity and peak efficiency. Operating with no condensate treatment could mean disaster for you down the line.

What the heck is Condensate?

Before we talk about why it is so important to treat your boiler system’s condensate, we should probably first discuss what condensate is and why it is important. (If you already know, please skip to the next section.) If you have a steam boiler, your boiler system produces steam. Steam leaves the boiler through piping to transfer heat to something; usually a heat exchanger or steam jacket. When the steam condenses in the pipe it is called condensate. This condensate water has very little impurities in it. In fact, condensate is practically 100% pure, clean water… and it’s very hot, which makes it the perfect fit for boiler feed water. That’s why one of the best things that you can do at your...

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The condensate tank receives the water from the boiler via a discharge line that runs from the bottom of the boiler. Inside the tank is a float, which triggers the condensate pump to start discharging the excess water. The pump will run until the water level in the tank no longer activates the float.

The water line from the condensate tank is either attached to the plumbing under a sink or basin or to an inside or outside drain. The line is placed in back of the waste trap to prevent it from running back up inside the basin. For this to work, the waste trap, or the "U" section, must measure at least 75 millimeters, or roughly 3 inches in length.

Some boiler and air conditioning systems have condensate tanks that have two pumps. One acts as a back-up for the other. These are two-stage systems. If the first pump doesn't start expelling the water when the first stage is reached, the second pump is triggered. During normal operations, the pumps will alternate being first...

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How does a condensing boiler work?
Condensing Boiler

This is a design of boiler which can have an increased efficiency over the more traditional boiler. The efficiency of a typical non-condensing boiler is around 75%, whereas with condensing boilers it can be over 87%. This increased efficiency is due to the extraction of heat from the otherwise wasted flue gases. Most boilers have a single combustion chamber enclosed by the waterways of the heat exchanger through which the hot gases can pass. These gases are eventually expelled through the flue, located at the top of the boiler, at a temperature of around 180°C.

Condensing boilers, on the other hand, are designed first to allow the heat to rise upwards through the primary heat exchanger; when at the top the gases are rerouted and diverted over a secondary heat exchanger. These can reduce the flue gas temperature to about 55°C. This reduction of temperature causes the water...

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How do I top up the water pressure?

Sometimes boilers need to be repressurised. This is quite normal and you can repressurise your boiler yourself. These videos show you how, whether you have a rigid or a flexible filling loop.

What should the pressure gauge on my boiler be reading?

The normal operating water pressure for your boiler and central heating system is between 1.0 and 2.0 bar. If the pressure drops below 1.0 bar, you need to repressurise it (see above). If the pressure goes above 3.0 bar, you will see water coming from the pressure relief valve (usually on an outside wall). You can reduce the pressure by bleeding a radiator or draining some water out of the system using a drain point , usually found underneath a radiator.

How do I reset my boiler?

If your boiler needs to be reset, these videos show you how, whether your boiler has a dedicated reset button, an ON/OFF/SELECTOR switch or a thermostat control knob.

Why isn’t...

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Choose the right power level

Are you building? Before thinking about boilers, examine other alternatives: the “passive house” (ultra-low energy requirements), without heating or with cogeneration (simultaneous production of heat and electricity).

If you have to replace an existing boiler, look for independent advice at the "Centre Urbain", from an architect, from someone you know who has done the same thing recently etc. Then consult the manufacturers’ websites, compare installation estimates and enquire about the reputations of the installers. Also ask the heating specialist to justify the choice of model that he suggests.

These are the most important points to be taken into account when making your choice.

1. The fuel

You can base your choice on the purchase price of the fuel. It is difficult to predict the development of the price of heating oil but everything suggests that it will be more expensive than natural gas in...
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CONDENSATE HANDLING - home - CONTENTS: Air Conditioning Condensate Handling Defects - when & how to inspect the air conditioner condensate drain system to find A/C condensate piping, leaks, hazards POST a QUESTION or READ FAQs about recognizing defects in air conditioner and heat pump condensate drain line piping, connections, traps, or disposal destination REFERENCES

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Air conditioner, heat pump & condensing boiler or furnace condensate handling & drainage defects:

This air conditioning repair article discusses the inspection, diagnosis, and repair of air conditioning condensate drainage systems, including condensate leaks, condensate piping, traps, drains, condensate pumps, and the detection and hazards of air conditioning, heat pump, or condensing boiler or furnace condensate piping, drains, & condensate leaks in buildings....

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In Part I of this three-part series, "Improving the Performance of Boiler Auxiliaries," we explored the air preheater (APH) and important performance calculations. Part II examines performance degradation resulting from corrosion and fouling that is caused by coal combustion flue gas constituents plus the effects of ammonia and sodium bisulfite injection for SO3 mitigation.

Formation and Deposition of Sulfuric Acid

Sulfuric acid (H2SO4) is formed as a vapor in the boiler by the association of sulfur trioxide (SO3) with water vapor. In the 600F to 660F range, both SO3 and H2SO4 are present in the flue gas, but H2SO4 is dominant. Below 600F, SO3 is almost completely converted to H2SO4.

The SO3 is initially formed by the reaction of sulfur dioxide (SO2) with atomic oxygen (O) in the post-flame region of the furnace and by the catalytic (heterogeneous) oxidation of SO2 with molecular oxygen in the convective pass of the boiler. The former is a homogenous reaction,...

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By Todd Fratzel on Heating

Update: This is a popular article written several years ago. While pricing may have changed the basic comparison still holds true today.

Heating Fuel – Propane Vs. Oil

When we built our new house one of the big decisions I had to make was what type of heating fuel to use. Should we use the traditional oil heat that over 90% of people in New England rely on? Or should we use propane (natural gas is not available here in this part of NH).

Pros and Cons

The answer to that question is pretty complicated when you sit down and think about it. For us I already knew we’d have propane in the house to cook with and for our direct vent fire place. For me one of my biggest concerns with oil was having an oil tank in my basement that could potentially leak some day.

The other big issue to consider was venting the two different types of fuel. An oil fired boiler would require either a direct vent out the side of the house...

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