@AVEDZ 

Hey

The distance this can reach is dependant on a LOT of things, it simply could be contention or the client device.  What are you using to connect to this?  

Bear in mind the signal needs to go both ways, so the AP could be sending you a very strong signal.. however your device being lower powered cant reply cleanly and that would appear as a "slow speed" and poor signal

If you use Android.. download WiFi Analyser and see what the Dbi is at distances, you are looking lower than -70 or so for good speeds (lower better).   Also try changing channels on the AP, again WiFi Analyser will show you what channels are used, just avoid them and choose something else!

No sadly it cant connect to Deco Mesh, they are very different products (Home grade vs Business Grade).  The EAP225 can do mesh, but only as part of the Omada range which is a very different thing :)

On a final note, be sure you are connected to the EAP225, as its not supportive of your existing Deco Mesh.. you may actually be connected to a different AP!  

Just my final thoughts.. perhaps this may not be the best choice for you.   Returning and changing for another Deco Node near the garden (beside window for example) or even the X50 Outdoors may be a better solution for you.   Just saying :)

  @AVEDZ 

How high are you installing this EAP225-outdoor? Maybe try to install it lower.

Or maybe move the antenna downward(diagonally)

  @AVEDZ   You mention you cannot even see or have extremely weak signal and that you are using a laptop for setup. Have you tried other wireless devices at that distance or just the laptop? Wi-fi adapters in laptops can be just as flakey as phones.  I would try another wireless device and see if you get the same results. If you use a phone, remove it from any case as they can drastically reduce range.

Any information you can provide on the install would be helpful such as install height, against wall or above, any obstacles between AP and desired location for reception, antenna orientation  (straight up on both).

  @d0ugmac1 

Personally I wouldnt be jumping straight to an AP issue, its the least likely solution.

If you can get an Android device, install WiFi analyser and post a screenie here of the results at 20m.  This will indicate what is going on.  

Also Apple devices, dont use Apple devices to test WiFi.. they lie! 

  @d0ugmac1 no I agree it could be the AP. It's probably more feasible to start a process of elimination by using devices you have and eliminating them as the issue. As far as the Deco system and laptop, what range has it been working fine?  If it has always been used in close proximity to thrle Deco system then you cant rule it out as having range issue. To many assumptions. If you try several devices and get the same results then you know where to turn your attention.  

  @d0ugmac1 

My concern is the OP is using an Apple device to make this assertation, likely an iphone which is arguably the worst phone to base this decision on.  We dont have details on the connection, RSSI or even device being used for testing, to make recommendations to change / RMA devices without basic testing imho is just crazy

If we had 4 or 5 results from 2 or 3 devices then we could advise better, however with lack of anything really concrete its just guesswork at this stage.  One should therefore avoid just claiming faulty hardware, not claiming you are wrong.. just think its a tad too early

  @Philbert yes he specifically does mention iphone in a follow up post. I agree he needs to try different devices at the very least to rule out the device itself. If he has the same issue with multiple devices then he can turn his attention elsewhere.

I see what d0ugmac1 is saying though, the drastic short range, with good performance up close, does sound almost like the AP is operating without the antennas, but again you can't determine that without trying multiple devices.