diff --git a/Changelog.md b/Changelog.md
index f8e6f28da..3e2c62a6f 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -30,6 +30,11 @@ __Bugfixes__
 - Fixes `nEC_x` calculation for a fossil fuel water heater w/ UEF entered.
 - Various HVAC sizing bugfixes and improvements.
 
+## OpenStudio-ERI v1.6.3
+
+__Bugfixes__
+- Fixes possible "Sum of energy consumptions do not match total" error for shared water heater w/ FractionDHWLoadServed=0.
+
 ## OpenStudio-ERI v1.6.2
 
 __Bugfixes__
diff --git a/workflow/energy_rating_index.rb b/workflow/energy_rating_index.rb
index 5dfc15f1c..71b3cc0a4 100644
--- a/workflow/energy_rating_index.rb
+++ b/workflow/energy_rating_index.rb
@@ -456,7 +456,7 @@ def get_eec(system, type, is_dfhp_primary = nil)
   end
 
   rated_bldg.water_heating_systems.each do |rated_sys|
-    next if rated_sys.fraction_dhw_load_served <= 0
+    next if rated_sys.fraction_dhw_load_served.nil?
 
     # Get corresponding Reference Home system
     ref_sys = reg_bldg.water_heating_systems[0]