gatrhumpy

iTrader: (1)

So my next step in making my house more energy efficient and reducing the cost of cold water that goes down my drain while waiting for the hot water to heat up is to add a point-of-use hot water heater to several faucets I have in my house. I'm starting with the master bathroom, and will be converting two sinks to tankless water heaters. I want to combine two sinks, that each have a flow rate of 1.72 GPM, into a single under-sink tankless hot water heater. That means I would need a tankless water heater that has a flow rate of 3.5GPM. My inlet water temperature is 76 degrees in late April (it's about 69 degrees in January).

There are a number of designs and options out there, but was wondering if anyone had any specific experience with under sink tankless hot water heaters. This is to augment my 50gal hot water heater in the garage.
I want one with a digital display and that shuts down once the inlet water temperature (from the existing hot water supply in the garage) reaches the outlet water temp (that goes to the faucet).

thoiboi

Have you looked into adding in a water recirculating pump so you don't waste water instead? That way you don't just add point of use tankless water heaters at places.

gatrhumpy

iTrader: (1)

I did not think of that.

gatrhumpy

iTrader: (1)

Most of those recirculating pumps use more energy and have a negative ROI compared to tank water heaters.

Dan

May try asking here; https://terrylove.com/forums/index.p...ater-forum.17/

1StGenCL

Terrylove forums are awesome and I had a tankless at each sink at my South Beach apt. It made weird noises, took up a bunch of room under the sink but was quick to heat up. I'd think the big expense would be getting power to each sink, no? Are they 120?

I, too have been looking at hot water heaters and thought the pumps were a positive thing but I didn't dive in too deep because it looks like a hybrid is best for South Florida, one of the few places in the states that hybrid works though.

gatrhumpy

iTrader: (1)

I will be running 8AWG wire soon for a 8kw 1.2GPM Rheem tankless water heater to my master bedroom sinks. I've been in the attic for the past three weeks installing a radiant barrier, do running wire us no big deal.

gatrhumpy

iTrader: (1)

I think I might be running the wire in the next couple of days. I bought the wire, and now just need to drill the holes down the top plate and run the 10AWG wire.