Tankless Water Heaters | McMaster-Carr

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30 Products

Point-of-Use Water Heaters

Also called tankless water heaters, these provide hot water on demand and take up less space than heaters with a tank. They are easier to install than gas tank heaters and don’t require a relief valve. All turn on when water flows through the heater and turn off when the flow stops.

Adjustable Thermostat with Digital Keypad—3/8" OD Bottom Compression Tube Connection

Image of Product. Front orientation. Water Heaters. Point-of-Use Water Heaters, Adjustable Thermostat with Digital Keypad—3/8" OD Bottom Compression Tube Connection.

Heaters with an adjustable thermostat let you set the exact water temperature you need.

Estimated Yearly Energy Cost @ Flow Rate—Estimated yearly energy cost is based on electricity cost of $0.12 per kWh. For more information, visit www.ftc.gov/energy.

	For No. of Faucets	Wattage, W	Current, amp	Est. Yearly Energy Cost @ Flow Rate	Max. Water Temp., ° F	For Water Pressure Range, psi	Flow Rate, gpm	Ht.	Wd.	Dp.		Each
240V AC, Single Phase



	102° F @ 0.5 gpm 51° F @ 1 gpm 34° F @ 1.5 gpm 26° F @ 2 gpm	1	7,500	32	Not Rated	140	30 to 150	0.2 to 2.5	10 3/4"	5 1/4"	3"	57565K86	0000000


	130° F @ 0.5 gpm 65° F @ 1 gpm 43° F @ 1.5 gpm 32° F @ 2 gpm	1	9,500	40	Not Rated	140	30 to 150	0.2 to 2.5	10 3/4"	5 1/4"	3"	57565K87	000000

Adjustable Thermostat with Screw—3/4 NPT Male Bottom Pipe Connection

Image of Product. Front orientation. Water Heaters. Point-of-Use Water Heaters, Adjustable Thermostat with Screw—3/4 NPT Male Bottom Pipe Connection.

Heaters with an adjustable thermostat let you set the exact water temperature you need.

Screws are inside the enclosure to prevent accidental movement.

For 4 Faucets—Heater for four faucets can be used with circular multistation wash fountains or a single shower.

Estimated Yearly Energy Cost @ Flow Rate—Estimated yearly energy cost is based on electricity cost of $0.12 per kWh. For more information, visit www.ftc.gov/energy.

	For No. of Faucets	Wattage, W	Current, amp	Est. Yearly Energy Cost @ Flow Rate	Max. Water Temp., ° F	For Water Pressure Range, psi	Flow Rate, gpm	Ht.	Wd.	Dp.		Each
240V AC, Single Phase



	87° F @ 1.5 gpm 65° F @ 2 gpm 52° F @ 2.5 gpm 43° F @ 3 gpm	4	19,000	80	Not Rated	110	40 to 150	0.7 to 3	10"	10 1/2"	3"	57565K42	0000000


	65° F @ 2 gpm 52° F @ 2.5 gpm 43° F @ 3 gpm 32° F @ 4 gpm	1	19,000	80	Not Rated	180	40 to 150	1.5 to 4	10"	10 1/2"	3"	57565K41	000000

Without Temperature Control—3/8" OD Bottom Compression Tube Connection

Image of Product. Front orientation. Water Heaters. Point-of-Use Water Heaters, Without Temperature Control—3/8" OD Bottom Compression Tube Connection.

Heaters without temperature control do not provide precise control. The temperature of the water coming out depends on the temperature of the water going in.

Estimated Yearly Energy Cost @ Flow Rate—Estimated yearly energy cost is based on electricity cost of $0.12 per kWh. For more information, visit www.ftc.gov/energy.

	Water Heaters													Replacement Elements
	Water Temp. Rise @ Flow Rate	For No. of Faucets	Wattage, W	Current, amp	Est. Yearly Energy Cost @ Flow Rate	Max. Water Temp., ° F	For Water Pressure Range, psi	Flow Rate, gpm	Ht.	Wd.	Dp.		Each		Each
120V AC, Single Phase



		41° F @ 0.5 gpm	1	3,000	25	$74 @ 0 gpm	150	30 to 150	0.3	10 1/2"	5 1/4"	3"	3556K71	0000000	3556K1	000000


		208V AC, Single Phase



				56° F @ 0.5 gpm	1	4,100	20	$74 @ 0 gpm	150	30 to 150	0.4	10 1/2"	5 1/4"	3"	3556K75	000000	3556K4	00000


				240V AC, Single Phase



						48° F @ 0.5 gpm	1	3,500	15	$74 @ 0 gpm	150	30 to 150	0.3	10 1/2"	5 1/4"	3"	3556K72	000000	3556K3	00000


						75° F @ 0.5 gpm	1	5,500	23	$74 @ 1 gpm	150	30 to 150	0.5	10 1/2"	5 1/4"	3"	3556K73	000000	3556K4	00000
						65° F @ 1 gpm 43° F @ 1.5 gpm	1	9,500	40	$74 @ 1 gpm	150	30 to 150	0.8	10 1/2"	5 1/4"	3"	3556K74	000000	57565K3	00000


						277V AC, Single Phase



								56° F @ 0.5 gpm	1	4,100	15	$74 @ 0 gpm	150	30 to 150	0.4	10 1/2"	5 1/4"	3"	3556K76	000000	3556K11	00000

Flow-Through Heating Elements for Water


With Temperature-Control Screw	With Temperature-Control Dial

Also known as circulation heating elements, these install directly into pipelines to quickly and efficiently heat liquid through direct contact. An adjustable thermostat automatically turns the heating element on when the temperature drops below the set temperature and off when it rises above the set temperature. Adjust the set temperature with the screw or dial.

Incoloy Nickel Heating Element—Incoloy Nickel heating elements are more corrosion resistant than copper heating elements.

				Heating Element			Temp. Control
	Wattage, W	Watt Density, W/in²	Current, amp	Lg.	Wd.	No. of	Method	Range, ° F	Pipe Size	Thread Type	Gender	Wire Connection		Each
Copper Heating Element with Bronze Body







				120V AC, Single Phase

				1,500	34	12.5	11 1/4"	4"	1	Screw	60 to 180	1	NPT	Female	Screw Terminal	3595K31	000000000


				2,000	47	16.7	11 3/4"	4"	1	Screw	60 to 180	1	NPT	Female	Screw Terminal	3595K32	00000000




						240V AC, Single Phase

						3,000	51	12.5	16"	4"	1	Screw	60 to 180	1	NPT	Female	Screw Terminal	3595K33	00000000


						Incoloy Nickel Heating Element with Aluminum Body







										480V AC, Three Phase

										6,000	50	7.3	28 13/16"	5 5/8"	3	Dial	60 to 250	1	NPT	Male	Wire Leads	35705K112	00000000


										12,000	50	14.5	39 9/16"	5 5/8"	3	Dial	60 to 250	1	NPT	Male	Wire Leads	35705K122	00000000
										18,000	50	21.7	51 5/16"	5 5/8"	3	Dial	60 to 250	1	NPT	Male	Wire Leads	35705K132	00000000
										24,000	50	29	37 5/16"	8"	6	Dial	60 to 250	2	NPT	Male	Wire Leads	35705K152	00000000
										40,000	50	48	55 3/4"	8"	6	Dial	60 to 250	2	NPT	Male	Wire Leads	35705K162	00000000

Flow-Through Heating Elements for Chemical Solutions


	5-15

Also known as circulation heating elements, these install directly into pipelines to quickly and efficiently heat liquid through direct contact. All are designed to heat chemical solutions at much higher watt densities than other immersion heating elements without damaging the heating element. An adjustable thermostat automatically turns the heating element on when the temperature drops below the set temperature and off when it rises above the set temperature. Adjust the set temperature with the dial. Heating elements automatically shut off at 202° F to prevent fire and heating element burnout. The heating element is titanium for excellent resistance to harsh chemicals.

			Heating Element												Adjustable Thermostat (90° F to 190° F)
	Wattage, W	Watt Density, W/in²	Lg.	Wd.	No. of	Pipe Size	Thread Type	Gender	Electrical Connection Type	Wire Connection	NEMA Type	Cord Lg., ft.	Enclosure Rating	For Use With	Current, amp	Temp. Control Method		Each
Titanium Heating Element with 304 Stainless Steel Body







				120V AC, Single Phase

				1,500	42	15"	5.7"	1	1 1/2	NPT	Female	Plug In	—	5-15	6	NEMA 1	Ammonium Hydroxide (0-3% Concentration) Ammonium Hydroxide (3-6% Concentration) Deionized Water Salt Water Water	12.5	Dial	4745T41	0000000




						240V AC, Single Phase

						3,000	84	15"	5.7"	1	1 1/2	NPT	Female	Hardwire	Wire Leads	—	—	NEMA 1	Ammonium Hydroxide (0-3% Concentration) Ammonium Hydroxide (3-6% Concentration) Deionized Water Salt Water Water	12.5	Dial	4745T43	000000


						4,000	112	15"	5.7"	1	1 1/2	NPT	Female	Hardwire	Wire Leads	—	—	NEMA 1	Ammonium Hydroxide (0-3% Concentration) Ammonium Hydroxide (3-6% Concentration) Deionized Water Salt Water Water	16.7	Dial	4745T44	000000
						6,000	167	15"	5.7"	1	1 1/2	NPT	Female	Hardwire	Wire Leads	—	—	NEMA 1	Ammonium Hydroxide (0-3% Concentration) Ammonium Hydroxide (3-6% Concentration) Deionized Water Salt Water Water	25	Dial	4745T46	000000

Flow-Through Heating Elements for Coolant

Also known as circulation heating elements, these install directly into pipelines to quickly and efficiently heat liquid through direct contact. To heat coolant without creating hot spots and damaging the heating element, they have a lower watt density than heating elements for water or chemicals. An adjustable thermostat automatically turns the heating element on when the temperature drops below the set temperature and off when it rises above the set temperature. Adjust the set temperature with the dial.

			Heating Element									Adjustable Thermostat (150° F to 560° F)
	Wattage, W	Watt Density, W/in²	Lg.	Wd.	No. of	Pipe Size	Thread Type	Gender	Electrical Connection Type	Wire Connection	For Use With	Current, amp	Temp. Control Method		Each
Steel Heating Element with Steel Body







				120V AC, Single Phase

				500	17	8 3/8"	4"	1	1	NPT	Female	Hardwire	Screw Terminal	Ethylene Glycol Water	4.2	Dial	3595K61	000000000


				750	17	13"	4"	1	1	NPT	Female	Hardwire	Screw Terminal	Ethylene Glycol Water	6.3	Dial	3595K62	00000000




						240V AC, Single Phase

						1,000	18	15 1/4"	4"	1	1	NPT	Female	Hardwire	Screw Terminal	Ethylene Glycol Water	4.2	Dial	3595K63	00000000