Unfortunately, Ikea faucets are pretty much non-repairable. Supposedly ikea will maintain faucet parts for up to two years past the discontinued date. Getting those parts from what I have heard is a pain and not cheap. So it's leaking where the sprayer head threads to the hose. One reason for this is a blockage in the sprayer head. Typically right at the entrance of the spray head is a screen and/or a check valve. Check to make sure there is no debris stopping the water from flowing freely. Too much restriction and water pressure builds up with nowhere to go. Usually, these are sealed with an o-ring. The spray head has male threads the connect to female threads of the hose. Check the O-rings or gaskets for splits, or cracks, or missing parts. Take the existing o-ring or gasket with you to home depot, Canadian tire, lowes, or princess auto (Ontario) to find the right-sized replacement. Specialty placing shops are good places for small parts. If you're in the Toronto area Taps (Dufferin and Lawrence), gingers (Caledonia & Castlefield) shops like this are good. Plumbing suppliers tend to not be good for repair parts like this. Too many parts and not enough margins. A picture with the spray head removed from the hose and a clear shot of the threads and inside the spray head would be helpful. More on reddit.com

10 year warranty. Use it 🤷🏼‍♂️. (I'm speaking about my market, make.sure there's a warranty where you are. You'll need a receipt) More on reddit.com

I'm thinking that you're missing a washer behind the nut, or a gasket under the base to keep things tight and secure. Look up the model # of your Moen faucet, you should be able to find an exploded parts view, and hopefully the part number for the missing washer or gasket. More on reddit.com

Plumber here. There's not really such a thing as a bifl faucet, but I would go one of two routes:

1)a domestic brand like American Standard, Moen, or Delta (assuming you're in the US or Canada) or;

2)grohe.

With the domestic brands, but from a plumbing supply place, not a big box store - companies often sell an identical looking faucet with different internals to big box stores so they can hit the requested price point. Lots of brands have "lifetime warranty" but imports or home depot specific models might take 3 weeks to send you a replacement part. I can get you a part for a 30 year old American Standard in the worst case scenario over night.

For something more high end I find Grohe is the most consistent with the quality of their hardware.

The difference between the two recommendations is cost vs appearance. I'm OK installing a $600 faucet for my own use in my nice kitchen but I wouldn't trust aa tenant enough to put one in a rental unit, no matter how high end.

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