Reduce S9 power consumption? Goal of ~1000W "modern" mining capacity

[natevw]

I'd like to replace a 1500W space heater with a miner.

Looks like the main contender would be a Bitmain S9 (since the R4 is basically unobtainium). The Bitmain site says re. power consumption:

1372W at the wall, with Bitmain’s APW3 PSU

So that seems fine on paper — possibly even easier on my circuit than current heater — BUT the APW3 product page frowns on 110V supply, and forum posts here seem to STRONGLY discourage powering the S9 via 110V at all.

I'm fine with a lower hashrate, and even lower efficiency if need be. Unfortunately, it also looks like it is no longer possible to underclock the S9? Is there any other way to reduce its power consumption, specifically would I be able to leave one of its three boards unpowered without worry?

Otherwise, would I be better of getting an L3+ with its "800W +10% at the wall, with Bitmain's APW3 PSU"? I'm not excited to get into other altcoins, but not completely opposed either. (I'm basically replacing electric heat from glowing wires with electric heat from hashing here, and I'd be covering the upfront cost from earlier heating experiment proceeds…)

Main criteria, in order of importance:

* would like to pay in BTC/BCH from trustworthy vendor
* generate around 1000W (± 500W) of heat on 110VAC
* avoid damaging the secondhand value of the miner
* as efficient as practical given the above constraints

Basically I'm up for investing in a current-generation miner, but it seems the "default choice" of an S9 would be hardware not intended/very strongly discourage to run off 110VAC? Can I safely disable a board while I use it, and get the benefit of investing in current-gen HW (i.e. resale value) but without the excessive load in my own use?

[philipma1957]

you need an older  s-9  with the old firmware.

this  older firmware allows the miner to be clocked down  to a low freq  such as 400

it also allow for the fans to be set to  40%

thus sound  is better
power draw is better

and the gear is still efficient  around .11 watts per gh 

you will do about 9000 gh and around 1000 watts at a freq of 400

[natevw]

Thanks, that might be ideal but the secondhand market for current-gen miners seems almost double the price of ordering from Bitmain directly — and I haven't been following these closely enough to be able to figure out which are old enough and how to make sure I get the right version.

What about powering only some of the S9 boards? Is that a feasible option or are there issues with that? (And if feasible, would the fan run quieter in that case too?)

Otherwise, are there any other suitable miners I've missed? I found the AvalonMiner 741 which might do, but it's out of stock and looks to be more equivalent to the S7 generation in efficiency.

[wavelengthsf]

Thanks, that might be ideal but the secondhand market for "new" miners seems almost double the price of ordering from Bitmain directly — and I haven't been following these closely enough to be able to figure out which are old enough.

What about powering only some of the boards? Is that a feasible option or are there issues with that?

Or, are there any other suitable miners I've missed? I found the AvalonMiner 741 which might do, but it's out of stock and looks to be more equivalent to the S7 generation in efficiency.

Yes, you could run with only powering 1 or 2 of the three boards. That would work. As long as each board got its ~500w of power, you'd be good (plus the controller.)