The Tank › Pre-emptive replacement of neglected but working heater in tight spot › Reply To: Pre-emptive replacement of neglected but working heater in tight spot
Gosh, thanks for all your advice. That is an interesting idea about venting via a Tee – I can see it would work fine from the physics angle, I would just have to run it by the inspector before trying to use it!
I’d never given that pressure regulator any thought, but the vent isn’t wide open at its end, it has a brass screw in it with a breather hole – presumably a vent limiter which hopefully makes it code-complaint to not vent outside. Not that I know anything, beyond 10 minutes of web searching 🙂 I did have the furnace installed around 8 years ago so I’d hope the inspector would have picked up on anything obviously bad.
Floor drain is approx 17ft away, so 4″ drop is a bare minimum.
Height from floor to flue is at best 56″.
The AO Smith power damper heater GCVL-40 is 54″ to top, and I’d guess does not have any removable parts to use your tee-venting trick, so gives me at most a 2″ platform for drainage – not enough.
The other AO Smith heater GVRL-40 is 51-1/2″ to top, so can give me my 4″ draining platform, and just squeak in under the flue without removing the draft hood – although I suspect your trick using the tee might well work better to draw effectively, rather than have an elbow directly above the hood.
The 2 heaters are around $130 apart after rebates (just using pexsupply prices as an example) so around a 5-year break-even from energy savings – possibly worthwhile but not THAT compelling. Anyway the dimensions of the situation seem to have made my decision for me!
I assume it doesn’t really make sense to replace the AO Smith anode from the outset with one of your heavy-duty ones, and I should just be inspecting the original periodically? I’m not too concerned about Al rods and health since we don’t drink any hot water.
AO Smith claim to have a brass drain valve, but I suspect this would still be gate type, in which case I would certainly replace it with one of yours.