US 2026/0043584 A1Published application

Integrated system for heating water

AssigneeCarnot Labs, Inc.

InventorsJacob Felser, Gabriel Parisi-Amon, Luke Winston, Matthew Bitterman, Robin Michael Graham-Hayes

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Abstract

One variation of a water heater includes: a housing; a water tank arranged within the housing and configured to store water received from a cold water supply of a building; a heat pump arranged within the housing and configured to heat water stored in the water tank; an inline heater arranged within the housing and configured to heat water exiting the water tank; and a mixing valve arranged within the housing and configured to combine cold water from the cold water supply of the building with hot water exiting the water tank. The water heater is configured to: detect a water temperature of water stored in the water tank; and, in response to flow of water from the water tank, selectively activate the inline heater based on the water temperature to supply hot water, proximal the target supply temperature, to the building.

Claims20

Dependent claims

A water heater comprising:

a housing;
a cold water inlet:
arranged on the housing;
and
fluidly coupled to a cold water supply of a building;
a water tank:
arranged within the housing;
and
configured to store water received from the cold water supply via the cold water inlet;
a heat pump:
arranged within the housing;
and
configured to heat water stored in the water tank;
an inline heater:
arranged within the housing;
and
configured to heat water exiting the water tank;
a hot water outlet:
arranged on the housing;
and
configured to fluidly couple the water tank to hot water supply lines within the building;
a mixing valve:
arranged within the housing;
and
configured to combine cold water from the cold water supply of the building with hot water between the water tank and the hot water outlet;
and
wherein the water heater is configured to:
at a first time:
detect a first water temperature of water stored in the water tank;
and
in response to flow of water from the water tank and in response to the first water temperature approximating a target supply temperature, supply hot water, proximal the target supply temperature, from the water tank to the building;
at a second time:
detect a second water temperature of water stored in the water tank;
and
in response to flow of water from the water tank and in response to the second water temperature falling below the target supply temperature, trigger the inline heater to heat water exiting the water tank toward the target supply temperature;
and
at a third time:
detect a third water temperature of water stored in the water tank;
and
in response to flow of water from the water tank and in response to the third water temperature exceeding the target supply temperature, at the mixing valve, combine cold water with hot water, exiting the water tank proximal the third water temperature, to cool water exiting the water heater toward the target supply temperature.

37 more elements

A water heater comprising:

a housing;
a cold water inlet arranged on the housing;
a water tank:
arranged within the housing;
and
configured to store water received from a cold water supply of a building via the cold water inlet;
a heat pump:
arranged within the housing;
and
configured to heat water stored in the water tank;
a hot water outlet arranged on the housing;
a recirculation pump:
arranged within the housing;
and
configured to purge cooled water from hot water supply lines within the building with water stored in the water tank;
and
wherein the water heater is configured to:
at a first time:
detect a first water temperature of water stored in the water tank;
and
in response to flow of water from the water tank and in response to the first water temperature approximating a target supply temperature:
supply hot water, proximal the target supply temperature and stored in the water tank, to the building;
and
at a second time:
in response to flow of water from the water tank:
trigger the recirculation pump to draw cooled water from the building to the water tank;
and
supply hot water, exiting the hot water outlet proximal the target supply temperature, to the building.

25 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/293,629Filed 7 Aug 2025
Priority: 7 Aug 2024
Published: 12 Feb 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

F24H 15/375
Characterised by control outputs; characterised by the components to be controlled: control of heat pumps
F24D 17/02
Domestic hot-water supply systems: using heat pumps
F24D 19/1054
For domestic hot water: the system uses a heat pump
F24H 4/04
Water heaters: storage heaters