I am seeking help from this community to come up a creative solution on how to make a minor/elegant modification to direct the steam exhaust to go outside and away from the house. Right now, it will fill up the gated utility room area and go up to the eve of the front porch area (may cover up the house vent at times). It's not possible to direct it to the rooftop per my contractor. This is in San Francisco area. Thank you so much for your suggestion and ideas in advance.

photo added HW Room Photo added

  • Photos would be useful. – herb guy Feb 23 '18 at 4:17
  • Why is rooftop not an option? It's the 'correct' solution. After that - you are better off moving the water heater to a different part of the house. – virtualxtc Feb 23 '18 at 14:16
  • Why does your tankless unit have a steam exhaust? What exactly is this unit? If it's the regular exhaust from a condensing unit (which can use PVC ducting), then you've got a few code requirements to deal with in keeping exhaust away from intakes and people. This particular situation does not look code legal. However, if this is just steam, you could always make a trap to condense it and let it simply overflow onto the concrete. Please add what type of unit this is. – Hari Ganti Feb 23 '18 at 23:36
  • Thank you for taking a look at the situation. I have attached a photo of the inside water boiler setup. The boiler is a Triangle Tube Prestige. How do I get a condensing unit (and what product to buy) to convert the steam into water? Would it impact the performance of the boiler in the long run? Thanks in advance! – Didi Feb 24 '18 at 18:47
  • Are you concerned about noise, or the water vapor (it's not steam)? – Bryce Mar 29 '18 at 7:20

The fact that this is PVC (type IV ducting) tells me this should already be a condensing unit, so the amount of steam should already be minimal.

There's nothing stopping you from projecting that pipe further away from your house as long as it doesn't get withing 3 feet of your neighbor.

Based on your interior pictures, I'd recommend just drilling another hole in he side of your house closer to where your unit (which is generally the preferred way to vent the unit), which should move the steam far enough from your house vent based on the pictures you provided.

Else, if you think you are still likely to have issues with the exhaust, you really should move it up to the roof / chimney.

However, as long as you don't obstruct the airflow, you could minimize the steam of the current outside vent by running it into something like a dryer vent bucket: https://www.homedepot.com/p/Everbilt-Indoor-Dryer-Vent-Kit-TDIDVKHD6/203626526

Be aware, that the exhaust from high efficiency water heaters is acidic and will eat away at any metals that might be part of your pail setup.

  • Thanks! I have attached how it's installed on the inside to give more perspective on this. I would like to find out what solution on the outside I can do. It's also not ideal to vent indoor because of the heavy steam. Heads for the heads up on the acidic outlet. You are right. This unit has such an outlet at the bottom and it was eating away the copper and the copper needs to be replaced now. – Didi Feb 24 '18 at 18:51
  • I was definitely NOT recommending venting inside as that will potentially expose you to carbon monoxide. If you are really getting that much steam, I'd guess you have a unit that should be using Catigory III not PVC venting. – virtualxtc Feb 26 '18 at 1:26

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