Dryer heat (130°F or higher, which dryers typically reach 150°F+ on the highest setting) will kill dust mites. Run the item for 10 to 15 mins longer after it's fully dry.

You will not be able to wash king sized quilts in less than 4.5 cu ft FL unless they are very thin and flexible. Speed Queen TL has a 3.5 cu ft capacity. You might be able to do a queen sized medium quilt and mattress pads. BUT the SQ does not have an on board heater in either its TL or FL models. SQ is discontinuing its domestic FL machines except for the stacked set. The TL has a new model that is not particularly well reviewed. Any new FL you consider will have automatic temperature control (ATC) which will set the water temperature to the levels specified by government regulation, not necessarily the temperature you set on the water heater. You can find many threads discussing both the temperature and water level issues. This makes an on-board heater a must for many users to insure the water is at a temperature that will kill the germs. Another problem is the fact that most washer manuals will not tell you exactly what temperature (degrees F or C) equals HOT. If the temperature is above 130F, the cycle might be named allergen, sanitary, or extra hot. It depends on the brand and the model. You can read and down load most manuals on line at the manufacturer's web site. You might also be interested in the washer videos available on YouTube.

I suggest you make a list of all the "must haves" for your washer. What is your budget? You may be surprised at the retail price of some of the FLs. Who provides the best service in your area? The fanciest washer is useless if there is a problem and no local service provider. For example, there is no local service provider for Electrolux or Samsung in my area so I didn't even consider them. I've had two Kenmore FL in the past 15 years. The first built by Whirlpool died after 9.5 years with a blown computer board. The board and service labor equaled 2/3 or the price of a new machine. The current Kenmore, built by LG, is 5.5 years old and hasn't had any problems. It's the 5.2 cu ft model and does the heavy bedding easily.

In case you didn't know, Whirlpool owns Maytag. Their machines are virtually identical under the cabinet. GE is now owned by Haier, a Chinese company.

Good Hunting.

I would only get a front loader with internal heater and -- most important allergen cycle. That will give you a guaranteed minimum 131F wash. Look for the capacity you want and an internal heater. LG makes that washer, I believe. Elux may as well.

Since your dealer only carries SQ and Electrolux I would get the Elux. I'm sure it has a sanitary cycle.

The Maytag MHW8200 is the only Whirlpool family model that still has Allergy cycle on it. For whatever reason, WP discontinued offering any other front loader with Allergy beginning with models in 2014. My 2011 WP duet still offered NSF P351 certification for Allergy and NSF P172 for Sanitary cycle. This Maytag still has the NSF P351` certification for Allergy. Otherwise, LG is it that offers similar certifications for these two cycles.

The quilts won't last long with regular washing at such high temps, whether washer or dryer. Could you consider switching to blankets instead?

We use two smaller comforters on our king bed, so we don't need a huge washer just to wash big comforters.

Once again, "sanitary" cycle is meaningless. Allergen is the standard. The cold-washing movement is likely causing manufacturers to do away with heaters in machines not to mention this makes them less expensive to produce.

If it's down to LG only, then that would be the way to go. I've used DDs LG and it's just fine.

Hot water does not cause wear. Wear is mainly caused by friction. Must disagree with cavimum here as I don't see that blankets will last longer than quilts in general. I personally could not go back to using traditional blankets.

This time last year I was exploring which washer and dryer to buy for my new home I was having built. As I was researching, I found some blogs that discussed how to get around not being able to fit king sized comforters into home machines. The solution was to wash the comforters in a bathtub. It would take about half an hour of your time (give or take) to actually wash, drain, rinse satisfactorily and then get ready to dry. Unless you have a small machine, you should be able to spin it out enough to dry in a dryer. If you explore this method, and are concerned about the water being hot enough to kill allergens, I recommend you raise the water temperature on your water heater, wait for about an hour for it to heat the water, then proceed. Do NOT forget to lower the water heater temp to avoid scalding hot water later.

I realized I never thanked you all for your response. Still looking for a washer and now a dryer. Read on the Laundymat forum about the maytag MVWP575GW Commercial Washer. Unfortunately, no one sells them in our small city. I'd have to order online. I decided I could live without the ability to wash King Quilts but need to be able to wash Queen Quilts. Has anyone ever purchased a large appliance online? Would love to hear your experiences.