Cambridge Cove II Water Heater Comparison

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Cambridge Cove II is an 80 unit apartment complex consisting of 8, 2-story buildings, a central clubhouse and community pool. Dwelling are made up of 56, 3-bedroom models (70%) and 24, 4-bedroom units (30%). Each unit is of single-level design located on either the first or second floor.

WATER HEATER COMPARISON
Gas Tank vs Gas Tankless

The apartments use natural gas for cooking, drying, space heating and hot water. Two 3-bedroom apartments have been instrumented to measure the savings of a tankless gas water heater (EF 0.82) over a tank-type gas water heater (ef 0.62) typically used by Atlantic Housing in their developments.

Feb 19 2013, 00:15 -To- Feb 20 2013, 00:00 EST

Hot Water Btu -- In/Out	Btu
Unit 101 Tank WH gas use	149940.0
Unit 101 Tank WH Output	100620.0
Unit 103 Tankless WH gas use	86598.0
Unit 103 Tankless WH Output	63851.0
Unit 103 Tankless WH Hydronic Output	788.0
Period Efficiencies	Out/In
Unit 101 Tank	0.67
Unit 103 Tankless	0.74
Unit 103 Tankless w/hydronic	0.75
Hot Water Flow	Tot. Gals
Unit 101 Tank	186.5
Unit 103 Tankless	127.9
Unit 103 Tankless Hydronic Loop	2.8
Hot Water Flow Rate	Avg GPM	Min/Max
Unit 101 Tank	0.9	0.2/ 2.1
Unit 103 Tankless	1.0	0.2/ 1.6
Unit 103 Tankless Hydronic Loop	0.9	0.7/ 1.4
Interior Conditions	Average	Min/Max
101 Thermostat Temp (deg.F)	68.4	63.8/ 73.7
103 Thermostat Temp (deg.F)	75.1	74.3/ 75.7
101 Thermostat Humidity (%RH)	46.3	40.7/ 53.9
103 Thermostat Humidity (%RH)	45.1	42.0/ 46.6
101 A/H Supply Air Temp (deg.F)	58.4	41.8/ 73.7
103 A/H Supply Air Temp (deg.F)	72.6	58.9/ 76.3