I did a google search and came back with industrial products, but no residential prosucts.

I have a System 2000 boiler and hot water tank. When the furnace is firing, the temp of the exhaust through the flue is around 400 degrees.

That seems like a horrible waste of heat.

Same thing with the dryer. It throws heat right outdoors, which also seems like a waste. (not really concerned with humid air, as it is winter and I have to run a humidifier anyway).

Is there any "safe" method to do recover waste heat from a boiler?


You should look into condensing boilers that do just that and capture a lot of heat that would normally fly out of the chimney. In fact they vent through a PVC pipe producing a lukewarm steam and have efficiency as high as 96%

So if your current boiler is close to the end of its usefull life, then upgrade might be a sensible investment.

However it's not a bad idea to evaluate your house as a whole. If its poorly insulated and drafty, then that should be addressed as well.

A lot of states and some energy companies offer free or very cheap home efficiency auditing and insulation programs.

| improve this answer | |
  • 1
    Yeah - the boiler was purchased/installed new 2 years ago: energykinetics.com - so it's a good boiler, but I hate seeing that thermometer in the flue vent get up to 400 degrees - it breaks my cheap heart – Jason Feb 1 '12 at 19:02
  • 1
    I am by no means an expert on hvac, but after looking at the energy kinetics website I felt like I just watched a billy maze infomercial. Claims that afue rating is wrong seem fishy. So maybe their boiler is just not that efficient – Vitaliy Feb 1 '12 at 21:51
  • yeah, now that I'm reading that - it does seem odd. If we had known we ere going to put in a pellet stove, I would have kept the old boiler and put in a gas on demand hot water system, because the boiler is barely firing (only for hot water and the back bedrooms) – Jason Feb 4 '12 at 19:01

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.