What size power station for a tankless gas water heater?

It needs a station with at least 79 W of continuous output. At the default 85% efficiency it takes about 93 Wh of rated capacity for its typical 1 h a day, and 744 Wh for 8 hours of running. 54 of the 54 power stations in the Enough Watts data set can power it. The smallest one that keeps it going for 8 hours of running is the BLUETTI Elite 100 mini (1,005 Wh).

Updated October 6, 2026

79W
Continuous output
None
Surge to start it
93Wh
Capacity for its typical 1 h a day
744Wh
Capacity for 8 hours of running
54 of 54
Stations that power it

Watts

Typical figures for this type, from the sources at the foot of this page. Watts vary by model and age. Check the label on your own appliance and enter it for an exact answer.

Running, typical: 79 W
Running, low to high: 63 W to 89 W
Starting: No start surge
Typical use a day: 1 hthe calculator starts from this, and you can change it
Average draw while on: 79 W
Voltage: 120 V

Explained in: Watts vs watt hours, explained and How to read an appliance label for watts.

The math

Worked with the typical figure, as the calculator does it.

Output79 W running, so the station's continuous output must be at least 79 W.
SurgeNo start surge: the running figure covers it.
Average draw79 W: the running watts count for every hour it is on.
A typical day79 W × 1 h = 79 Wh a day.
Typical 1 h a day79 W × 1 h = 79 Wh usable, ÷ 0.85 = 93 Wh of rated capacity.
8 hours of running79 W × 8 h = 632 Wh usable, ÷ 0.85 = 744 Wh of rated capacity.
On the BLUETTI Elite 100 mini1,005 Wh × 0.85 = 854 Wh usable, ÷ 79 W = 10.8 h.

Stations that run it

Every power station in the data with this appliance alone plugged in, at 85% efficiency. Type the running watts from your own label and the table works it out again.

Running watts

Typical 79 W, from 63 W to 89 W. Watts vary by model and age. Check the label on your own appliance and enter it for an exact answer.

54 of 54 power stations run it at 79 W.

Power stations for a tankless gas water heater (electrical draw) at 79 W
Power station	Can it power it	Running time	Output	Start surge
BLUETTI Elite 10 Mini	Runs it	1.4 h	200 W	300 W
Jackery Explorer 240 v2	Runs it	2.8 h	300 W	600 W
EcoFlow RIVER 3 Plus	Runs it	3.1 h	600 W	1,200 W
BLUETTI Elite 30 V2	Runs it	3.1 h	600 W	not published
Jackery Explorer 300 v2	Runs it	3.1 h	300 W	600 W
Goal Zero Yeti 300	Runs it	3.2 h	350 W	600 W
Goal Zero Yeti 500	Runs it	5.4 h	500 W	1,000 W
DJI Power 500	Runs it	5.5 h	1,000 W	not published
Jackery Explorer 600 v2	Runs it	6.9 h	500 W	1,000 W
Goal Zero Yeti 700	Runs it	7.3 h	600 W	1,000 W
BLUETTI Elite 100 mini	Runs it	10.8 h	700 W	1,050 W
BLUETTI Elite 100 V2	Runs it	11.0 h	1,800 W	3,600 W
EcoFlow DELTA 3 Classic	Runs it	11.0 h	1,800 W	3,600 W
Anker SOLIX C1000 Gen 2	Runs it	11.0 h	2,000 W	3,000 W
EcoFlow DELTA 3	Runs it	11.0 h	1,800 W	3,600 W
EcoFlow DELTA 3 Plus	Runs it	11.0 h	1,800 W	3,600 W
Pecron E1000LFP	Runs it	11.0 h	1,800 W	3,000 W
DJI Power 1000	Runs it	11.0 h	2,200 W	4,400 W
Anker SOLIX C1000	Runs it	11.4 h	1,800 W	2,400 W
Jackery Explorer 1000 v2	Runs it	11.5 h	1,500 W	3,000 W
BLUETTI AC180	Runs it	12.4 h	1,800 W	2,700 W
ALLPOWERS R1500	Runs it	12.4 h	1,800 W	3,000 W
Jackery Explorer 1000 Plus	Runs it	13.6 h	2,000 W	4,000 W
Goal Zero Yeti 1500	Runs it	16.2 h	2,000 W	3,600 W
Jackery Explorer 1500 v2	Runs it	16.5 h	2,000 W	4,000 W
Jackery Explorer 1500 Ultra	Runs it	16.5 h	1,800 W	3,600 W
ALLPOWERS R2500 V2	Runs it	20.7 h	2,500 W	4,000 W
Jackery Explorer 2000 v2	Runs it	22.0 h	2,200 W	4,400 W
Jackery HomePower 2000 Plus v2	Runs it	22.0 h	2,400 W	4,800 W
EcoFlow DELTA 3 Max	Runs it	22.0 h	2,400 W	4,800 W
Pecron E2400LFP	Runs it	22.0 h	2,400 W	4,000 W
Anker SOLIX C2000 Gen 2	Runs it	22.0 h	2,400 W	4,000 W
EcoFlow DELTA 3 Max Plus	Runs it	22.0 h	3,000 W	6,000 W
OUPES Mega 2 Pro	Runs it	22.0 h	2,500 W	not published
DJI Power 2000	Runs it	22.0 h	3,000 W	not published
BLUETTI Elite 200 V2	Runs it	22.3 h	2,600 W	not published
Anker SOLIX F2600	Runs it	27.5 h	2,400 W	2,800 W
BLUETTI Apex 300	Runs it	29.7 h	3,840 W	not published
BLUETTI Elite 300	Runs it	32.4 h	2,400 W	4,800 W
EcoFlow DELTA 3 Ultra	Runs it	33.1 h	3,600 W	7,200 W
Anker SOLIX F3000	Runs it	33.1 h	3,600 W	7,200 W
EcoFlow DELTA 3 Ultra Plus	Runs it	33.1 h	3,600 W	7,200 W
Pecron E3600LFP	Runs it	33.1 h	3,600 W	7,000 W
ALLPOWERS R3500	Runs it	34.1 h	3,200 W	6,000 W
ALLPOWERS R4000	Runs it	37.2 h	3,600 W	6,000 W
BLUETTI Elite 400	Runs it	41.3 h	2,600 W	5,200 W
Anker SOLIX F3800	Runs it	41.3 h	6,000 W	9,000 W
Anker SOLIX F3800 Plus	Runs it	41.3 h	6,000 W	9,000 W
Goal Zero Yeti PRO 4000	Runs it	43.0 h	3,600 W	7,200 W
EcoFlow DELTA Pro 3	Runs it	44.1 h	4,000 W	8,000 W
OUPES Guardian 6000 V2	Runs it	2.1 days	6,000 W	9,000 W
Jackery Explorer 5000 Plus	Runs it	2.3 days	7,200 W	14,400 W
EcoFlow DELTA Pro Ultra	Runs it	2.8 days	7,200 W	10,800 W
EcoFlow DELTA Pro Ultra X	Runs it	5.5 days	12,000 W	not published

Add it to the runtime calculator with the rest of your list

What moves the number

Gas heats the water; electricity runs only the fan, the igniter and the controls, 63 W to 89 W while hot water flows. In freezing weather the anti frost heaters can draw more than that, so a heater in a cold space needs more headroom.

Questions

How many watts does a tankless gas water heater use?

About 79 W while running, from 63 W to 89 W across the models in our sources. Watts vary by model and age. Check the label on your own appliance and enter it for an exact answer.

Can a portable power station run a tankless gas water heater?

Yes. All 54 power stations in the Enough Watts data set can power it on its own. It takes at least 79 W of continuous output.

How long will a power station run a tankless gas water heater?

It depends on the battery. At 85% efficiency the smallest station that powers it, the BLUETTI Elite 10 Mini (128 Wh), gives about 1.4 h. The largest, the EcoFlow DELTA Pro Ultra X (12,288 Wh), gives about 5.5 days.

Does a tankless gas water heater need extra watts to start?

No. It has no motor or compressor, so it draws about its running watts from the moment it is switched on. The check that matters is a continuous output of at least 79 W.

Sources

Researched from these pages, then checked against them a second time.

Rinnai Builder's Specification R85e (REU-V2532W) maker specification sheet, checked October 6, 2026
Rinnai R75LSi (REU-VA2528FFUD) Specification Sheet maker specification sheet, checked October 6, 2026
Rinnai RUCS75i (KCM2528FFU-US) Specification Sheet maker specification sheet, checked October 6, 2026
Rinnai Builder's Specification R94LSi (REU-VB2735FFUD-US) maker specification sheet, checked October 6, 2026

We read published figures and do the math; we do not measure appliances. The methodology states every formula on this page. Capacities are rated watt hours: 1,000 Wh rated gives 850 Wh usable at the default.