
SEBO
AIRBELT E3 Premium
Ultra-durable, 10-year warranty, but expensive with short cord.

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Preach. Miele’s turning into Dyson-lite and it’s sad. Check out SEBO K2/K3 or even Numatic Henry Allergy. They're built like tanks, bags are cheap, filters are solid, no Wi-Fi nonsense.
I switched from Miele to a Henry Allergy model and like it a lot. I still like Miele’s hard floor brush so I have that rigged on the Henry. I think Miele have the best air filtration but Henry is very close and hundreds less $.
My understanding is that the the Henrys (except for the Henry Allergy) do not have HEPA filtration. The HEPA-FLO bags that they sell are not actually HEPA filters - they use it as a trademark rather than to indicate it is HEPA filtration which is why I am not too keen on their HEPA claims for the Henry Allergy. Are they sweeping something under the carpet? I otherwise think Henry is an awesome vacuum cleaner except that I used the HEPA FLO bags for a while until I discovered that they were not true HEPA so felt deceived. Are you aware of any third party testing for Henry Allergy?
I went for the green hypoallergenic Henry. Good for pethair
For cordless vacuums I think an effective multi-cyclone system is a must so that the filter doesn't get clogged to quickly. Removable and replaceable batteries are also a must have so that the vacuum isn't a paperweight if the battery wears out or fails. Look for a brand with replacement parts available such as the brushroll, filters, and batteries. I recommend the LG CordZero Kompressor for cordless vacuums and you should add the LG Slim Floor Nozzle with the soft brushroll since you have all hard floors. Overall the LG CordZero is a good cordless vacuum I'd definitely get one of the models with the Kompressor lever because it helps empty the bin without having to stick your fingers in it. LG sells a bunch of different models so I'd look for one with a charging stand, 2 batteries, and the Kompressor lever. One of the Auto-Empty bins would be nice too. Even though the LG is a good cordless vacuum a corded canister vacuum will be the vacuum you want for weekly deep cleans. The Sebo K2 Kombi and Henry Allergy are 2 very powerful but quiet canister vacuums. The hose and tools will be much easier to use for above floor cleaning than holding all the weight of a cordless vacuum. If you walk barefoot, you can feel that a corded vacuum cleans hard floors more thoroughly than any cordless vacuum. So my recommendation is a good cordless vacuum and a good corded canister vacuum. You can get by with just a cordless vacuum but I think you'll really appreciate what a good corded vacuum can add.
A bagged vacuum with Hepa bags or synthetic bags are usually better at filtering air than bagless vacuums. Bagless vacuums have more seals and detachable parts that can get dirty or warped. Most bagless vacuums have a foam filter and a small hepa filter. Most bagged vacuums have a large hepa/synthetic bag and a synthetic or hepa exhaust filter. Henry vacuums all have hepa bags and they are a certified steal in the U.K. The compact Henry and Hetty are currently £129. The Henry Allergy £159 and Henry Clean Air £199 use the hepa bags plus a hepa exhaust filter so they're even better for allergies. They're are also sorts of store specials and sales so check around. Thoughts?
A bagged vacuum with Hepa bags or synthetic bags are usually better at filtering air than bagless vacuums. Bagless vacuums have more seals and detachable parts that can get dirty or warped. Most bagless vacuums have a foam filter and a small hepa filter. Most bagged vacuums have a large hepa/synthetic bag and a synthetic or hepa exhaust filter. Henry vacuums all have hepa bags and they are a certified steal in the U.K. The compact Henry and Hetty are currently £129. The Henry Allergy £159 and Henry Clean Air £199 use the hepa bags plus a hepa exhaust filter so they're even better for allergies. They're are also sorts of store specials and sales so check around. Thoughts?
If you only have tile a suction-only canister vacuum will work well. You don’t need a carpet powerhead since you don’t have carpets, but if you find a good deal on a vacuum with a carpet powerhead you can just leave the powerhead on the side. I’d look for a Miele C1, Miele C3, Sebo K2, Sebo E1, Sebo D1, or Henry 160. They’re all very good canister vacuums. I like Sebos more than Mieles because they are a little more durable. You have to be more careful that a used Miele wasn’t abused by running it without a bag or using generic bags that let dust wear down the motor. There are a number or commercial canister vacuums that are also good at hard floors like the Nilfisk GD930. If you find a good enough deal can be attractive. Electrolux canister vacuums are pretty solid, the old brick looking ones. I’m not the biggest fan of them as they don’t roll as well as newer canisters. Avoid Kirbys, they’re made for carpets and avoid Rainbow vacuums as the water creates more work and weight. Hope that helps.
A bagged vacuum with Hepa bags or synthetic bags are usually better at filtering air than bagless vacuums. Bagless vacuums have more seals and detachable parts that can get dirty or warped. Most bagless vacuums have a foam filter and a small hepa filter. Most bagged vacuums have a large hepa/synthetic bag and a synthetic or hepa exhaust filter. Henry vacuums all have hepa bags and they are a certified steal in the U.K. The compact Henry and Hetty are currently £129. The Henry Allergy £159 and Henry Clean Air £199 use the hepa bags plus a hepa exhaust filter so they're even better for allergies. They're are also sorts of store specials and sales so check around. Thoughts?
I agree with the Henry recommendation, they're very durable vacuums with strong suction, but they are surprisingly quiet. Henry 160 is the smallest canister good for homes. I think you should check out the Henry 200 and Henry 240, their bag compartment holds more and the cords are longer. I think your clients will really like his face and you can draw/add some body builder arms on his tub. Henry fits standard 1.25 inch tools so adding a good Wessel Werk hard floor brush is easy. Backpack vacuums are good for covering large areas that are not cramped or confined. I do not like backpacks if you have to bend and move stuff a lot or stop vacuuming frequently.
All of the cheaper cordless vacuums have more battery and motor problems within a year. No matter the price or brand I recommend getting a cordless vacuum with replaceable batteries and replacement parts available. It looks like the Xiaomi G20 does not have a replaceable battery so I would avoid that. If you live in the U.K. I would take advantage of the amazing prices you have on Henrys. The Henry Quick Pet is on sale for £219 and a regular corded Henry is £129. Thoughts?
Iso +1 Henrylle, se vihreä allergiamalli tarkalleen. Ihan pomminvarma laite, ei ole montaa hajoavaa osaa.

SEBO
AIRBELT E3 Premium
Ultra-durable, 10-year warranty, but expensive with short cord.

Numatic International
Henry Canister Series
Budget king, super durable, but heavy and poor on carpets.

SEBO
AIRBELT D4 Premium
Durable, powerful, long cord, but heavy and pricey.

SEBO
FELIX Premium
Durable, powerful, good for allergies, but heavy with awkward attachments.

Miele
Classic C1 Cat & Dog PowerLine
Durable, powerful, quiet, but very expensive, short cord.

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
Numatic International - Henry Canister Series

Ranked #1
Dyson - V15 Detect Series