diff --git a/simulation/agents.py b/simulation/agents.py
index f57af89..303861b 100644
--- a/simulation/agents.py
+++ b/simulation/agents.py
@@ -539,9 +539,9 @@ def install_heating_system(
 
         if self.boiler_upgrade_grant_available:
             if heating_system == HeatingSystem.HEAT_PUMP_AIR_SOURCE:
-                self.boiler_upgrade_grant_used = 5_000
+                self.boiler_upgrade_grant_used = 7_500
             if heating_system == HeatingSystem.HEAT_PUMP_GROUND_SOURCE:
-                self.boiler_upgrade_grant_used = 6_000
+                self.boiler_upgrade_grant_used = 7_500
 
     def reset_previous_heating_decision_log(self) -> None:
 
diff --git a/simulation/costs.py b/simulation/costs.py
index 71734e7..ac9a310 100644
--- a/simulation/costs.py
+++ b/simulation/costs.py
@@ -288,9 +288,7 @@ def estimate_rhi_annual_payment(
     annual_heat_kwh_delta_capped = (
         rhi_kwh_cap
         if annual_heat_kwh_delta > rhi_kwh_cap
-        else 0
-        if annual_heat_kwh_delta < 0
-        else annual_heat_kwh_delta
+        else 0 if annual_heat_kwh_delta < 0 else annual_heat_kwh_delta
     )
 
     rhi_annual_payment_gbp = int(
@@ -327,7 +325,7 @@ def estimate_boiler_upgrade_scheme_grant(
         return 0
 
     if heating_system == HeatingSystem.HEAT_PUMP_AIR_SOURCE:
-        return 5_000
+        return 7_500
 
     if heating_system == HeatingSystem.HEAT_PUMP_GROUND_SOURCE:
-        return 6_000
+        return 7_500
diff --git a/simulation/tests/test_costs.py b/simulation/tests/test_costs.py
index 4e069b8..f2eb43e 100644
--- a/simulation/tests/test_costs.py
+++ b/simulation/tests/test_costs.py
@@ -251,13 +251,13 @@ def test_boiler_upgrade_scheme_grant_is_non_zero_for_heat_pumps_when_grant_is_ac
             estimate_boiler_upgrade_scheme_grant(
                 HeatingSystem.HEAT_PUMP_AIR_SOURCE, model
             )
-            == 5_000
+            == 7_500
         )
         assert (
             estimate_boiler_upgrade_scheme_grant(
                 HeatingSystem.HEAT_PUMP_GROUND_SOURCE, model
             )
-            == 6_000
+            == 7_500
         )
 
     def test_air_source_heat_pump_unit_and_install_costs_floored_at_gas_boiler_cost_for_households_with_air_source_heat_pump(
diff --git a/simulation/tests/test_model.py b/simulation/tests/test_model.py
index 462ee5c..032be17 100644
--- a/simulation/tests/test_model.py
+++ b/simulation/tests/test_model.py
@@ -39,10 +39,10 @@ def test_increment_timestep_updates_boiler_upgrade_scheme_cumulative_spend_gbp(
         assert model.boiler_upgrade_scheme_cumulative_spend_gbp == 0
 
         household_using_boiler_upgrade_grant_ASHP = household_factory()
-        household_using_boiler_upgrade_grant_ASHP.boiler_upgrade_grant_used = 5_000
+        household_using_boiler_upgrade_grant_ASHP.boiler_upgrade_grant_used = 7_500
 
         household_using_boiler_upgrade_grant_GSHP = household_factory()
-        household_using_boiler_upgrade_grant_GSHP.boiler_upgrade_grant_used = 6_000
+        household_using_boiler_upgrade_grant_GSHP.boiler_upgrade_grant_used = 7_500
 
         model.add_agents(
             [