Check the installation details of the machine of question. The minimum and maximum standpipe height is usually stated. It varies per brand and model per how high the tub may fill (minimum to avoid siphoning) and how strong is the machine's pump (maximum).

Speed Queen TC5003:

"Check standpipe height. The recommended height for the standpipe is 36 inches [914 mm]. Standpipes higher than 4 feet [1220 mm] are not recommended"

LG WT7305CW or WT7005CW:

"Do not install the drain hose with the end lower than 29.5 inches (75 cm) or higher than 96 inches (244 cm) above the bottom of the washer or more than 60 inches (152 cm) away from the washer."

>>>"Would my drain height be an issue?"<<<

Depends on which model SQ washer you have your heart set on.

Basically, higher standpipe drains result in slower draining which is a bigger problem for some SQ models than others.

The slower draining seems to be a major issue for the TC5 model (so-called "classic" top-load model). That's the one with a manual "recommending" against standpipes higher than 4 feet.

For SQ's TR series top-load models (the "agi-tub top load" models designated as as TR7, TR5 and TR3) the manuals say:

"Standpipes higher than 4 feet [1220 mm] will result in slower draining and may extend cycle times. ... NOTE: Machine will not drain if standpipe is higher than 8 feet [2438 mm]."

For SQ's current FF7 front load models, the manual has a chart listing the drainage flow rate for standpipe heights ranging from 3 feet up to 8 feet. The machine is rated to pump out 8.6 gallons-per-minute/32 liters-per-minute with a 36"/0.9m high standpipe with the rate declining down to 4 gallons-per-minute/15.2 liter-per-minute with a standpipe at 8 ft./2.4 m. above floor level. As best I could tell when I looked into this a year and something ago, an FF7 with an 8 foot tall standpipe might take about 5 to 10 minutes longer to run a washload than one hooked to a 3 foot tall standpipe, depending on how many rinses you've selected..

Thanks guys - this is helpful. May not be exactly the news I wanted to hear since I did want the TC 5 - but at least I know and can figure it out from here.

A plumber can likely install a lower standpipe for you if you really want that washer.

@katesullivan73 --- If you want to consider lowering your standpipe -- or alternative plumbing solutions --- it can be worth consulting a plumber as opaone suggested. That is because of technical code requirements that govern the height, diameter and positioning of new and revised washing machine drain lines. From that, you can compare costs for getting what you want versus buying something else that can drain to the existing standpipe.

For something that is somewhat like the SQ TC-5 but which could drain to the existing 6-foot high drainpipe --- have you looked at the Maytag Commercial MVWP575gw model? It seems to be an often discussed (sometimes touted, sometimes panned) residential/commercial alternative to the SQ TC-5.

My own house also has a tall standpipe in the basement laundry room. I found I could not lower the existing standpipe drain below 68" high. That proved to be the minimum height needed to meet code requirements for the minimum height of vertical pipe above the code-required p-trap where the line transitions to a horizontal run over to where it connects with the house's drain waste line when sloped at the code required ¼-inch per foot. The constraint was how and where the 1910 builders placed the main waste line to the sewer. Short of digging and installing whole new and much lower main waste line out to the sewer --- a huge and unaffordable expense for me --- the existing standpipe cannot go any lower. YMMV, so it may be worth your while to check with plumbers if you aren't code-savvy.

FWIW, I found the more affordable solutions to my house's plumbing constraints came down to: (a) limiting my washer choices to models with drain pumps rated to drain up to an 8-foot/96"/2.4m high standpipe; or (b) installing a large laundry sink (one large enough to hold all the wash water draining from a cycle) and installing and wiring in a lift pump rated for draining a laundry sink, an example being a SaniFlow SaniVITE. (There are plenty of other models, that just happens to be the one I researched.)

Thanks everyone! My appliance store said there is an extension kit I can use and reached out to speed queen to confirm it’s use.

SQ TR 3/5/7 have a small 85-watt electric pump separate from the drive motor.

TC5 has a non-electric pump mounted to and driven by the main 1/2-HP motor that drives the agitation and spin functions. I'd figure it has a stronger pump output to better-handle a standpipe more than 4 ft.