Laars LT150PRX1

Laars LT150PRX1 is a gas tankless water heater from Laars rated 4.3 GPM at a 0.98 UEF.

Efficiency
Uniform Energy Factor (UEF) 0.98
Annual gas use (natural gas) 173 therms/yr
Recovery efficiency 98 %
Annual propane use 189.07 gal/yr
General
Fuel Propane
Capacity
Max flow rate 4.3 GPM
Draw pattern High
Minimum activation flow 0.5 GPM
Performance
Gas input rate 150 kBTU/h
Installation
Max current draw 2 A
Vent type Power Direct Vent
Vent size 2 / 3
Smart features
Smart / connected capable No
Dimensions
Width 17.3 in
Depth 14.8 in
Certification
ENERGY STAR certified Yes

Real flow rate by climate

A tankless heater's usable flow depends on how far it must raise incoming water temperature. Sustained hot-water flow of the Laars LT150PRX1 at common temperature rises (a typical shower uses about 2 GPM of mixed water):

Temperature rise Climate Sustained flow Simultaneous showers
45 °F Warm climate (~75 °F groundwater) 4.3 GPM 2
55 °F Mild climate (~65 °F groundwater) 4.3 GPM 2
70 °F Cold climate (~50 °F groundwater) 4.2 GPM 2
77 °F DOE test condition 3.8 GPM 1

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Frequently asked questions

Is the Laars LT150PRX1 ENERGY STAR certified?

Yes, the Laars LT150PRX1 holds a current ENERGY STAR certification for water heating efficiency (UEF 0.98).

How much does the Laars LT150PRX1 cost to run per year?

About $510 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.

What venting does the Laars LT150PRX1 use?

The Laars LT150PRX1 uses Power Direct Vent venting with 2 / 3 in vent connections. Matching the existing vent type is usually the cheapest replacement path.

Is the Laars LT150PRX1 a smart water heater?

No, the Laars LT150PRX1 is not connected-capable — it has no app connectivity or demand-response support.

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