Ask A Question
HVAC Questions? Ask an HVAC Expert for Answers ASAP
Heat Exchanger Problems
What is a heat exchanger?
A heat exchanger is a device that circulates a liquid or gas through tubing inside it. Depending on whether your HVA unit is set to heating of cooling, the liquid or gas will be warmer or cooler than the ambient temperature. As air blows over the tubes of the heat exchanger, it absorbs the heat or cold from the tubes and changes the temperature on the home. Heat exchanger are found in refrigerators, water
and a wide range of appliances. Read below where Experts have given answers to heat exchanger questions.
A check with a carbon monoxide detector found that there is a leak from the seam at the top of the heat exchanger on my Rheem 1603-25 gravity floor furnace. Is it safe to weld it closed?
Carbon Monoxide is a very hazardous gas and welding the a seam closed to stop a leak is not recommended as it could happen again. Replacing the heat exchanger is the safer option.
How do you connect titanium heat exchanger tubing to copper tubing?
The best way of connecting 2 dissimilar metals is with a mechanical connector like a Sharkbite or some other device with a push lock coupling. Please check the rating of the coupling. Most are rated at 240 plus degrees which should be fine as tube temperatures are generally well below this.
The heat exchanger on my 18 year old Teledyne Laars model HH0400C hot water boiler has ruptured and is leaking water all over. I have a quote for $6,000 for replacing the heat exchanger. Would it be better to replace the whole boiler?
Teledyne Laars is a good make and if yours is an old cast iron model, it can last up to 30 years and more. It is always advisable to get more estimates to try for a better price and consider replacing the heat exchanger instead of spending money on a new boiler.
My17 year old Evcon DGRT070AUB (gas forced air) heat exchanger has developed a crack. Is heat exchanger repair advisable or should I buy a new one?
With a 17 year old unit replacement instead of repair is the most advisable. Most heat exchangers come with at least a 20 year warranty, in which case you will only pay the labor cost. Check the plate with the serial number. There is generally a date code there. Once you know that check your warranty to see if it is still valid and if you don’t have the information, contact the company and see if the warranty coverage still exists.
How often should a heat exchanger be descaled?
The frequency of heat exchanger descaling depends on various factors, especially water hardness. In general, it should be done once every 2 to 3 years. A professional service company or Expert should be used to inspect the unit and the scale to determine the best cleaning method. An Expert can also give you an idea of how frequently it should be done based on their knowledge of your local water. You can also consider a water softener if you have hard water. If you have an open loop system, it will use a continuous supply of water untreated water which will lead to much greater scale formation
Whys is there a flame outside the heat exchanger? The burners ignite but the first one has a wide flame that does not completely enter the heat exchanger. I changed the burners, but it made no difference.
The common reason for this happening is a blocked cell in the secondary exchanger. It could be due to water or slime. You could try plugging the top hole tightly and using a tube or hose from an air tank to blow out the blockage. If this does not help it would be best to get a technician to check the unit. Heat exchanger replacement because of this problem is not uncommon.
A defective heat exchanger can affect the efficiency of your HVASC system or your water boilers. Care must be taken when dealing with heat exchanger problems as the tubing inside is easily damaged. It is best to consult your owner’s manual when attempting any heat exchanger repairs and if the help you need is not to be found there, getting the advice of an Expert is the best alternative.
Recent Heat Exchanger Questions
Rick, I have been using an HVAC contractor who prefers the
Rick, I have been using an HVAC contractor who prefers the Rheem 14AJM 96% series.(Not ECM). A potential customer showed me a link to some negative reviews and I am not familiar with the manufacturers, etc... Do you have a preferred manufacturer that you
feel is the best value and good quality? The units must be Energy Star rated. Thank you for your valued opinion.
I have a Ruud Achiever 90 Plus furnace, 7 burners. The first burner, one closet to the fl
I have a Ruud Achiever 90 Plus furnace, 7 burners. The first burner, one closet to the flame sensor, flickers and will not stay on. After about 2 minutes, the furnace shuts off.The burners and modulator were cleaned and the flame sensor replaced, which I don't believe was defective. I've had 3 different HVAC technicians out attempting repairs, still no heat.The last one said The heat exchanger unit was PROBABLY cracked and that I now need a new furnace. I've spent $500.00 so far on service calls. I'm a widowed senior citizen and don't know whom to trust and have no knowledge what tests, if any should be performed to confirm that the heat exchanger unit is cracked.
I recently cleaned my heat exchanger on my Goodman furnace
I recently cleaned my heat exchanger on my Goodman furnace after it kept shutting down due to lack of flow through the bottom coils due to clogged tubes. It ran great for a couple days and now won't stay lit after about 20 mins. I can smell the exhaust in the house and the blower will keep running even if I shut the Thermostat off, I have to go down and turn off the power for it to reset. I also have to push in the sensor button on the right hand side of the burner which had popped to shut it down. The blower motor is running properly but I noticed it is black inside and it's not one I can take apart. Is it possible the pressure switches or sensors could just be bad or is it not blowing hard enough to vent properly? It is two stage and it never really seemed to heat as quickly as others I have encountered. I replaced the burners and the flame flows much harder through the tubes but I feel it is something with the exhaust pressure. Thank you for any suggestions
View More HVAC Questions
3 HVAC Technicians are Online Right Now
Ask Your Own HVAC Question
Ask Your Question Now
Ask a HVAC question
Type Your HVAC Question Here...
3 HVAC Technicians are Online Now
In The News
How JustAnswer Works:
Ask an Expert
Get a Professional Answer
Ask Followup Questions
100% Satisfaction Guarantee
Ask a HVAC Technician
Get a Professional Answer. 100% Satisfaction Guaranteed.
3 HVAC Technicians are Online Now
Type Your HVAC Question Here...
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.
Become a Professional
Terms of Service
Privacy & Security
© 2003-2015 JustAnswer LLC