Per Michizure, all pets should have 150 healing receptivity. It works as a percentage, so pets should get healed 150% of the base heal.

On direct nano heals, it works perfectly. Average of 50% more healing.

On perks, it's a bit odd. The first tick of Pet Reconstruction gets a 50% bonus (as expected). Repair Pet gets no bonus at all (strange). Bio Rejuvenation gets a 50% bonus.

An Engineer with no heal efficiency bonus from equipment, spamming A Maker's Repairs on cooldown, would have 159,840 pet healing/minute (though they'd be burning through 13,320 nano/minute as a nanocost-capped NM).

Cool.