diff --git a/group_vars/default/pvc.yml b/group_vars/default/pvc.yml
index d74a19a..c752350 100644
--- a/group_vars/default/pvc.yml
+++ b/group_vars/default/pvc.yml
@@ -72,11 +72,16 @@ pvc_asn: "65500"
 pvc_routers:
   - "192.168.100.1"
 
-# Ceph OSD tuning
-# > Uncomment in low-memory situation (nodes with <32GB RAM).
-# > These options are *only* applied at cluster bootstrap and cannot be changed later.
+# Memory tuning
+# > Uncomment these options in low-memory situations (nodes with <32GB RAM).
 # OSD memory limit - 939524096 (~900MB) is the lowest possible value; default is 4GB.
+# > This option is *only* applied at cluster bootstrap and cannot be changed later
+#   here, only by editing the `files/ceph/<cluster>/ceph.conf` file directly.
 #pvc_osd_memory_limit: 939524096
+# Zookeeper heap memory limit, sets Xms and Xmx values to the Java process.
+#pvc_zookeeper_heap_limit: 32M
+# Zookeeper stack memory limit, sets Xss value to the Java process.
+#pvc_zookeeper_stack_limit: 32M
 
 # Node list
 # > Every node configured with this playbook must be specified in this list.
diff --git a/roles/pvc/templates/zookeeper/environment.j2 b/roles/pvc/templates/zookeeper/environment.j2
index 8e763b2..e571fd2 100644
--- a/roles/pvc/templates/zookeeper/environment.j2
+++ b/roles/pvc/templates/zookeeper/environment.j2
@@ -13,6 +13,6 @@ JMXLOCALONLY=false
 #   cluster is only ~5.2MB of raw JSON data and beyond 12x that seems like a cluster too large for PVC.
 # Xms/Xmx=128M
 #   Reduce the Java memory size to minimize RAM consumption by Zookeeper.
-JAVA_OPTS="-Djava.net.preferIPv4Stack=True -Djute.maxbuffer=67108864 -Xms128M -Xmx128M"
+JAVA_OPTS="-Djava.net.preferIPv4Stack=True -Djute.maxbuffer=67108864 -Xms{{ pvc_zookeeper_heap_limit }} -Xmx{{ pvc_zookeeper_heap_limit }} -Xss{{ pvc_zookeeper_stack_limit }}"
 JAVA=/usr/bin/java
 CLASSPATH="/etc/zookeeper/conf:/usr/share/java/jline.jar:/usr/share/java/log4j-1.2.jar:/usr/share/java/xercesImpl.jar:/usr/share/java/xmlParserAPIs.jar:/usr/share/java/netty.jar:/usr/share/java/slf4j-api.jar:/usr/share/java/slf4j-log4j12.jar:/usr/share/java/zookeeper.jar"