An energy system for supply of hot water

An energy system comprising:

• a high temperature water heater and a high temperature storage tank arranged to deliver hot water on a high temperature line,
• a heat pump and a low temperature storage tank arranged to deliver lower temperature water on a low temperature line,
• a plurality of hot water supply circuits each arranged to:
• receive high temperature water from the high temperature line,
• receive low temperature water from the low temperature line, and
• deliver a process water supply at a desired high, low, or intermediate temperature in an outlet line, in which a supply circuit delivering water at an intermediate temperature is arranged to blend the high temperature and low temperature flows;
• and
• a controller configured to control the system.

A method of operation of an energy system comprising:

• a controller,
• a water heater,
• a high temperature water tank,
• a high temperate water line,
• a low temperature water tank,
• a low temperature water line,
• a heat pump,
• a plurality of hot water supply circuits each having an outlet line,
• the method comprising the steps of:
• the high temperature water heater and the high temperature storage tank delivering hot water on the high temperature line,
• the heat pump and the low temperature storage tank delivering lower temperature water on the low temperature line,
• the hot water supply circuits:
• receiving high temperature water from the high temperature line,
• receiving low temperature water from the low temperature line, and
• delivering a process water supply at a desired high, low, or intermediate temperature in the outlet line, in which at least one of said hot water supply circuits delivers water at an intermediate temperature by blending the high temperature and low temperature flows.