Could this be used to slowly heat a small above ground pool? Just wanting it warmer.

Funny how all of the answers here are probably not, I doubt it or I wouldn't. Don't answer the question if you don't actually know. I use the eco 8kw coupled to a standard water heater recirculation pump and it works well for 2000 gallon pool. I would say though 8 kw is minimum for this much water. I can maintain 80°F in ambient temp of 60° (nightly low) to high of 72°. I run it about 2-4 hours a day depending. Costs about $3 - $6 to run per day. Hope this is useful information.

will freezing weather damage it

As long as the water is able to run though the pipes it won't but the water won't be very hot. Only heats the water to a certain degree above original temp. Check the specs on the web site for more detail.

To replace a 40 gallon water tank heater with 40 amp fuse, is this a feabile diy project?

The EcoSmart 8 isn’t capable of replacing a 40 gallon water heater. The 40 gallon heater is designed to supply hot water to every faucet in the house. The EcoSmart 8 is a point-of-use water heater designed to supply heated water to only one faucet, and usually only a bathroom faucet.

ASIN	B00529DDUI
Best Sellers Rank	#1,878,582 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #2,037 in Instant Water Heater
Brand	EcoSmart
Colour	White
Department	All Ages / Unisex
Efficiency	99.8%
Generic Name	Electric Tankless Water Heater
Global Trade Identification Number	00854920002183
Heat Output	8 Kilowatts
Included Components	electric tankless water heater
Is Electric	Yes
Item Depth	6.1 inches
Item Weight	2 kg 150 g
Item model number	ECO 8
Manufacture Year	1987
Manufacturer	Ecosmart
Maximum Flow Rate	2 Gallons Per Minute
Mounting Type	Wall
Net Quantity	1.0 Count
Product Dimensions	20.3W x 29.2H Centimeters
Special Feature	LED Display
Style	ECO 8
UPC	854920002183
Voltage	240 Volts
Wattage	8000 Watts

ECO 8 Tankless Water Heater, Electric, 8-kW - Quantity 1, 12 x 8 x 4

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