DESIGNING WITH HEAT

PUMP WATER HEATERS

By GARY KLEIN AND

SEAN ARMSTRONG

sean@redwoodenergy.tech 707.826.1450

gary@garykleinassociates.com 916.549.70801

THE SOUTH LEADS IN BUILDING ELECTRIC HOT WATER SYSTEM IN MULTAMILY

HOUSING TO SAVE INFRASTRUCTURE CONSTRUCTION COSTS

ARCATA, CA LED WITH THE FIRST 100%

SOLAR OFFSET APARTMENT COMPLEX

(2012) AND USED HEAT PUMP HOT WATER

HEAT PUMP WATER HEATER MANUFACTURERS

(ALSO SOLD UNDER OTHER BRAND NAMES)

MULTIFAMILY ZNE RESEARCH SITES

FOR HEAT PUMP HOT WATER STUDY

WHOLE HOUSE VARIABILITY IS HIGH, YET BOTH LOWEST

CONSUMPTION AND AVERAGE CONSUMPTION INCREASE

BY ONLY 1 KWH/PERSON

IN ENERGY STAR CERTIFIED APARTMENTS IN

CALIFORNIA, DHW IS THE LARGEST LOAD

DHW ENERGY USE IS FLAT FOR 2-5 OCCUPANTS;

RESISTANCE CAN BE AVOIDED WITH HOTTER STORAGE

(E.G. 135F), MORE VOLUME (E.G. 65-80 GALLONS)

RESISTANCE ENERGY IS USED TO MEET

PEAK LOADS TWICE A DAY

Heat

Pump

CENTRAL HOT WATER SYSTEMS USE

TWICE AS MUCH ENERGY

(BOTH GAS AND ELECTRIC)

Calistoga Family ApartmentsFunded by Tax Credits, USDA 514 and CUAC Utility

Allowances. Central HVAC/DHW Hydronic systems

double energy use.

CENTRAL HOT WATER SYSTEMS USE

TWICE AS MUCH ENERGY

(BOTH GAS AND ELECTRIC)

EPIC Central Heat Pump

DemonstrationEdwina Benner Plaza, Sunnyvale, CA

Edwina Benner Plaza, Sunnyvale, CA

CENTRAL HOT WATER SYSTEMS USE TWICE AS MUCH ENERGY

(BOTH GAS AND ELECTRIC)

CENTRAL HOT WATER SYSTEMS USE TWICE AS MUCH ENERGY

(BOTH GAS AND ELECTRIC)

CENTRAL BOILER TO HEAT PUMP RETROFIT

ENERGY SAVINGS

HEAT PUMPS FOR POOLS

King Station Apts, King CityFunded by Tax Credits, USDA 515

Belle Vista Apts, LakeportFunded by Tax Credits, USDA 515

ZERO NET CARBON MULTIFAMILY IS GETTING TALLER

WITH 80 GALLON HEAT PUMPS IN HALLWAY CLOSETS

SUPPORTING 2 APARTMENTS

Coliseum Place in Oakland, by RCD Hillandale Gateway in DC, by Duffie Inc.

GO LOW STEP 1: 80 GALLON HEAT PUMPS IN HALLWAY CLOSETS;

3/8” AND ½” COPPER FROM MANIFOLDS SUPPORTING 1-2 FIXTURES;

MINIMAL BENDS, 26+ PSI MAINTAINED

CAN LESS FASTER HOT WATER DELIVERY

REDUCE BEHAVIORAL WASTE?

STRUCTURAL AND BEHAVIORAL WASTE ARE

ROUGHLY EQUALLY RESPONSIBLE FOR

WASTING 25+% OF SHOWER DHW

GO LOW STEP 2: A THERMOSTATIC VALVE

TO HALT BEHAVIORAL WASTE AND LOCK

IN STRUCTURAL WASTE SAVINGS

GO LOW STEP 3: A VARIETY OF 1.5 GPM

SHOWERHEADS ARE FAVORABLY REVIEWED,

2.0 GPM FOR RAIN HEADS