I have so far installed some higher BTU (commercial--Laundromat) wall hung Peerless and they were only about $1,000.00 each (delivered) and 200KBTU+ each, and was able to hook 2 up together with their kit (about $75).
I was wondering about the Tagkagi ones, even though they are more money and less BTUs. They are available on the internet but I can't remember on which site I saw them. You can let us know which ones you like and the advantages/disadvantages you find using them. Just don't make it sound like a commercial (hehehehe).
SPECIAL vent kits are sold separately for these units by Peerless, but I do not know about other brands.
We service guys rather know AHEAD of time if there is a particular benefit that any one of these units may have, or a particular problem too!
The DISADVANTAGE I found with the Peerless wall-hung 200KBTU units was that you can only put 2 together with the kit. If you needed to put 3 or more together, which I would have done 3-4 on this installation, you needed to buy an expensive 'controller' which costs as much or more than one of the units. The customer wanted to 'try' it that way first, then if it was not enough, separate half of the plumbing and install another two units.
Good idea from a customer! Laundromats have easily accessable plumbing so it would by child's play to re-plumb half the store! ONLY the hot would have required it. Ended up it is working fine right now with about
10 washers ever being used at one time. He actually has 20 washers but not as many customers-----yet. The water is not exactly "HOT-HOT" when all machines are being used together but better than just warm.
I do not know if this is 'customary' with these type of units or not. I do know that the 'link kit' had something to do with 'sharing' one 'brain' and turning both units on at the same time. There was no 'link kit' for linking 3-5 units together but they did offer a 'controller that had 'cute lights' on it and every unit would plug into it via harness.
I guess you haven't had the pleasure of doing a commercial job yet requiring 500KBTUs or more. Let us know.
Charlie
(old dog in a new kennel society)