will this work with a shower?

No. If you want to shower you will need a higher power unit. ie 6 or 9kw. Also it depends on your cold water feed temperature, the warmer the water the less heating is reqd. Hope this helps.

can a 13 amp plug supply the unit

No it won't as it is 3.7Kw that's 16.08 Amps, should really be on its own circuit.

The newly installed unit does not heat water. What is the warranty procedure outside the 30 day period?

Can't help with the warranty unfortunately, but the water flow and pressure need to be in the correct range. If there isn't enough flow, it won't switch the power on, and if you have too much water flowing through it won't be heated up enough. I had to fit a pressure reducing valve in my system. A 3.7kw is only suitable for a wash basin or a small sink. Hope I have been some help to you.

What turns it on in operation? Has it an internal pressure switch?

Not sure, but it comes on when tap turns on so must be pressure or flow. I have 6 years untroubled use although plumber nearly fitted it the wrong way around and you need to be gentle with the plastic fittings mine came with. Chris

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Dafi DAF37 Water Heater 3.7 kWh

Product ID: 56424934

Details

Brand
Dafi
Capacity
1 litres
Colour
White
Power source
Corded
Special feature
Energy-saving

⚡3.7 kW power for instant heat

🌿Eco-friendly energy-saving design

💧2.5 L/min flow rate for efficient use

Description

🔥 Instant warmth meets eco-smart living 🌿

COMPACT SLEEK DESIGN - Modern, space-saving white unit fits discreetly in any cloakroom or bathroom, elevating your space without clutter.
ECO CONSCIOUS EFFICIENCY - Energy-saving technology reduces your carbon footprint while keeping utility bills in check.
USER FRIENDLY INSTALLATION - Clear flow direction indicators and included fittings make setup straightforward for professionals and DIYers alike.
INSTANT HOT WATER ZERO WAIT - Experience immediate warmth with 3.7 kW power, perfect for quick handwashing or small bathroom use.
RELIABLE RESPONSIVE SUPPORT - Backed by a responsive seller and proven durability with over 7 years of trusted use in real homes.

The Dafi DAF37 Water Heater delivers instant hot water with a powerful 3.7 kW output and a steady 2.5 L/min flow rate. Its compact, sleek design fits perfectly in small bathrooms or cloakrooms, combining energy-saving eco-friendly technology with easy installation. Ideal for millennials seeking efficient, stylish, and sustainable home upgrades.

Specifications

ASIN	B005EQY5FG
Best Sellers Rank	363,544 in DIY & Tools ( See Top 100 in DIY & Tools ) 940 in Water Heaters & Parts
Brand	Dafi
Capacity	1 litres
Colour	White
Customer Reviews	3.6 3.6 out of 5 stars (74)
Efficiency	A
Flow Rate	2.5 Litres Per Minute
Global Trade Identification Number	05900950921637
Heat Output	3700 Watts
Included Components	4-way connector, Seals, Spring clamp, Tap output, Tap valve, Water heater
Is Electric	Yes
Item Depth	8.6 cm
Item Weight	898 g
Manufacturer	Dafi
Maximum Pressure	8 Bars
Model Number	DAF37
Mount Type	Wall
Number of Items	1
Number of Packs	1
Part Number	DAF37
Power source	Corded Electric
Special Features	Energy-saving, eco-friendly design
Style	Indoor Installation
Unit Count	1.0 count
Voltage	230 Volts
Wattage	3700 watts

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