Can this be used on a electric hot water heater?

In most cases, yes. The timer is rated to handle 40 amps at 240 volts and typical water heaters draw slightly less than 20 amps at that voltage. Some water heaters, however, can draw substantially more. Check the circuit breaker for your water heater to find out how much the circuit can deliver. If it is more than 40 amps, do NOT use this timer but if it is less than 40 amps, it should be fine.

Will a rain sensor work with this timer?

The timer can't work with a rain sensor.

Can this timer be used on a gas water heater?

Not for any gas water heater I'm familiar with. Unless your water heater plugs into the wall, how would aa timer control the water heater? Even for an electric water heater, the timer is only rated for 40 amps. (Yes, technically there is a way but unless you are a master electrician, it would be very unsafe).

Will this replace Intermatic R8806p101c sprinkler timer?

Yes, it will. It can be wired for either a single leg of 120 Volts or to a Poly Phase up to 277 Volts. 50-60 Hertz. It's also good for up to 40 Amps whereas the mechanical timer is good only to 30 Amps. Simple wiring instructions are included with it for your application. I installed mine of a water heater. in my shop. I also purchased their Wi-Fi version for a second water in my house.

Digital Timer Box | Desertcart Lithuania

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€ 96.21

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Sold byAmazon LithuaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⏳ Take control of your pool’s rhythm—never miss a beat or a swim!

EFFORTLESS SETUP - Removable timer module and versatile wiring options make installation a breeze.
WEATHERPROOF WARRIOR - Durable, UV-resistant, flame-retardant housing built for extreme outdoor conditions.
UNINTERRUPTED SETTINGS - Built-in battery backup preserves your schedule for 3 months during outages.
POWERHOUSE COMPATIBILITY - Handles dual 2HP motors at 120-277 VAC with robust 40A capacity.
PRECISION SCHEDULING MASTERY - Program up to 20 ON/OFF cycles weekly for ultimate pool control.

The DEWENWILS Pool Pump Timer is a versatile, heavy-duty digital timer switch designed for 2HP pool pumps and motors. Featuring up to 20 programmable ON/OFF schedules across 7 days, a 40A capacity supporting 120-277 VAC, and a 3-month battery backup, it ensures reliable, energy-efficient operation. Its weather-resistant, flame-retardant housing withstands harsh outdoor environments, while easy installation options make it perfect for professional-grade pool and spa management.

Specifications

ASIN	B08Q7NKZ7M
Battery Life	3 months
Best Sellers Rank	#34,475 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #18 in Electrical Timers
Brand	DEWENWILS
Brand Name	DEWENWILS
Color	White
Customer Reviews	4.3 out of 5 stars 1,085 Reviews
Item Type Name	Pool timer
Manufacturer	Dewenwils
Manufacturer Part Number	HODT01B
Material	Plastic
Material Type	Plastic
Model Number	T40D
Number of Items	1
Number of settings	20
Unit Count	1 Count

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