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Hot Water Heaters

1.3K views 16 replies 12 participants last post by  Darin lee  
#1 · (Edited)
I have not purchased a new water heater in about 25 years. So far the existing one at the shop is still doing fine. In my private quarters there, I flip the switch when hot water is needed. Otherwise it stays off. This has cut the electric bill way down for all these years. Three phase commercial electricity does not come cheap, so cutting costs where I can.

Since the cabin is getting closer to being occupied most of the time, water and an affordable way to heat it comes into play. Over the last 20 years I have acquired several low mileage electric heaters. But sitting so long, I didnt bother to do anything but toss them to the curb.

Checking availability of what is current did not surprise me. Cost is about what I expected for a common 30-50 gallon residential upright tank. Electric of course. Nothing on these has really changed over the years. Hard to get any more economical when heating with a direct short. It is one way and that is your only option.

For most standard style 30 to 50 gallon water heaters still sell for about $350-500. This is about par for what I was expecting. They were not that much cheaper 20 years ago. It seems manufacturing cost is stable and demand is still strong.

So I looked at compact style water heaters. These are smaller in size and many are powered by 120 volts, instead of 220. They might be anything up to 12 gallons. Some even 20 gallons. The big difference is the cost. The majority of them were pushing $600-800.

This doesnt exactly make sense. But nowadays not much else does either. The size is less than half and heating is also about one half. Only one heating element. Aside from half the materials to make the water heater, nothing else is any different. Except the price jumps way up.

I was hoping to pick up something affordable. But conventional water heaters in the compact variety seem to be out of my range now. Full size are just too big. Basically anything with a tank is too big to hide anywhere.

Tankless water heaters used to be really expensive, but that has changed. They cost roughly the same as equivalent in size to standard tank models. But there is a much broader price range than the standard tank models. Plus there are all types of variants like mini-tank. Some of these gets expensive. The point of use are not bad in cost considering, but very limited on output when water temp is a bit on the cold side.

My initial plan was to go tankless. But I dont like the high amp draw when in use. The compact water heaters were next in line. But most of them are 120 volts. That limits me to a commercial model powered at 220. I would like to keep between 12 and 20 gallons. But these tend to be the most expensive to choose from.

This puts me back to considering a very small tankless. Not a point of use, but the smallest general use I can find. I would like to keep under a 50 amp two pole breaker. I would really like to keep it under 40 amps. But that is right about the demand of point of use models.

After searching for what is available, I am back to considering building my own. Cutting 30 gallon tank in half, but keep both of the heating elements in use. Then flip the switch 15 minutes before use and remember to turn it back off afterwards. Water will stay hot for a day if not relied on for much after it has been heated and turned off.

Heating water for now is not something I want to deal with using the pot belly stove, or solar heating panels. That is way too much trouble and seasonally backwards to what is ideally functional.

So now I am sitting here thinking of alternatives that may be of help to assist conventional means to heat water. Anything to offset the cost of using electricity or being solely reliant on it all the time. This is one thing that solar panels could be of use if a large number of them were dedicated to only powering up a direct current water heating element. Wow I just might be on to something.

During the main daylight hours of optimum sunshine, have a well insulated water tank wired directly to a timed switch that automatically powers up the heating elements for however many hours in the day is useful to produce decent output.

I know it is a lot of amperage, but on a very small scale something might be doable. Just keeping a few gallons hot during the day would offset the electric bill. A smaller tank with lower amperage elements that stays powered for several hours is still free hot water. This could work well enough for a single person use if someone were to ration during off months.

I dont expect to heat water like is normal for most residences. But an alternative source to assist the main heater would be a step in the right direction. Even if it was only a pre-heat tank that feeds the main hot water heater during colder months. This is an option that could pan out.
 
#3 ·
I found the same thing when trying to find a smaller WH, below the standard 30 or 40 gallon sizes the prices were higher. I ended up just getting a 30 gallon (propane) model and if I need to conserve propane I'll shut it off and only fire it up a few minutes before I need it.

I did consider an electric model when designing our system, and replacing one of the AC heater elements in it with a DC one wired to a charge controller set to dump-load mode, so excess power was diverted to water heating after the batteries were charged. This type system was pretty common in the 'old days' of PWM controllers anyway, and initially thought I might upgrade mine for something like this at some point. In actual usage however, with my smallish amount of solar power (by today's standards anyway), I found I rarely have excess power - and when we do I start a load of clothes or run the dishwasher. Will be interested to see what you come up with for your solution.
 
#4 ·
I replaced my 40 year old electric a few years back with a 40 gallon propane.

The main reason I went with propane/gas fired was it has fast "recovery". With my old electric, if I washed a load of clothes, I couldn't take a shower afterwards for an hour or more. Until the electric heated-up a new tank of hot water again.

Advantages of propane/gas fired: fast recovery, generally cheaper to run, smaller size than electric (because of fast recovery).

Disadvantage: requires venting

Electric: Easier to install (no venting needed). Usually larger size than a gas fired. Good if you have solar power to supplement the line electricity.

Disadvantage: slower recovery, electricity more expensive than gas.

If you use a lot of hot water--especially with a family, and especially at certain times of day---you might want gas fired.
 
#5 ·
Why the obsession with electricity? I know someone who has what might be a whole house sized electric unit in his shop- it takes 3-40 A circuits, but it’s faster than propane, and responsive to using it to feed a pressure washer, it SSo Modular’s better, giving him warm water for hand washing ( the sink is 3’ from the heater). He wanted electricity becase there is a small closet connected to the “ vanity” such that the combined space has a sink, pressure washer, water heater, a regular heater ( to keep everything from freezing) and a few shelves to store water based fluids and a few cans of soup/soda/water bottles, plus 2 water fire extinguishers on the floor. Having propane in this small enclosure seemed like a bad idea.

Propane , unless you buy 20 lb tanks at Walmart, is cheaper, and the heaters are more capable ( unless you have 120 A to spare). Tankless are more efficient ( not keeping a tank hot 24/7j and the condensing versions can be vented with PVC pipe.

Unless you are in a really weird situation, your commercial 3 phase should be cheaper per kW than residential. Sometimes if you have something like a 15 hp motor, the demand rate may be high, but the kW charge isn’t. Same if you get 3 phase for a small service (200A or less) unless in a multi tenant occupancy.
 
#10 ·
I played around with that for several years. The one big downside is when the sun is not shining bright there aint no hot water. Just using a bell jar with one gallon plastic milk jug. Even on colder days, inside the bell jar, there was some heat. But no sooner does the sun get blocked or setting, that water cools down fast.

This is one inconvenience I am staying away from for now. Too much headache for what little gain there is. Not to mention is useless except when the weather is warm to hot all day. In tough times I would fire up the wood stove and go that route. For everything else, use the Master Card and buy a real water heater.
 
#7 · (Edited)
Depending on how dirty you are, and how many are living there - I have been using a German made Stiebel Eltron 235089 SHC 6 6 Gallon Water Heater, 120v 1300w,. It's only 6 Gal, but that's enough for a shower and kitchen sink, and only uses 1kw of power per day. (17 cents worth). On sale right now at $240 from Amz.
So far, I've had it for 2 years, and never needed more hot water than it supplies.
Obviously not suitable if you need to wash clothes every day in hot water, and/or have more than 1 person using it. Although, it "recycles" pretty quickly. 1/2 hour is usually enough, if people can wait.
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This replaced a propane heater which was costing a lot to keep fed.

At the time, I considered a tankless, but the likelyhood of scale buildup, maintenance problems, and having to wire an extra 60 or 80 amp circuit, along with the high price and early reports of "not enough hot water" discouraged that plan.
 
#11 ·
At the time, I considered a tankless, but the likelyhood of scale buildup, maintenance problems, and having to wire an extra 60 or 80 amp circuit, along with the high price and early reports of "not enough hot water" discouraged that plan.
This is one I am considering. If there was a 12 gallon version and 220 volt elements would sell me fast. But so far nothing comes close. Except for those overpriced compact tank models. They are still too bulky for the space, but I can make do if nothing else fits better.
 
#9 · (Edited)
Narrowing down what I have found, some of these look promising. Not in any particular order.

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â–˛The Stieble Eltron are the highly rated. This one is the 6.6 gallon mini-tank point of use. I would prefer it to be 220 volts and designed to be hard wired in. But only a single element 110 plug in.â–˛

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â–˛The Steible Eltron Tankless water heater Tempra Trend 12. It requires a 50 amp two pole breaker. This is about the max I want to wire in to the panel.â–˛

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â–˛The Ecosmart 8 may be just a bit on the small side. It requires a single two pole 40 amp breaker. Max draw is 33 amps. If I knew how this would handle cold water in the winter, would be something to consider.â–˛

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â–˛This Ecosmart 11 is just a bigger version. It would do everything I need. But does use a 60 amp two pole breaker. It just about maxes out at 57 amps.â–˛

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â–˛This is an off brand for RV use. At 13 gallons and horizontal mounting, would fit very well in a dead spot. If this was a 220 dual element, I would be interested. Instead is a single and a wall plug in. Not a big deal to hard wire this. I dont like weak connections on high amp draw usage items.â–˛

So these are what I am tossing around at the moment. There is plenty more choices out there. I would still like a compact tank model. Something like this one above is more to my liking. But the heating elements fall short of what I would prefer.

I can hard wire in and connect to a 20 amp wall switch. Then flip it on 15 minutes before using. There would be more than enough warm water left over after use available for rest of the day.

Tossing around ideas for the moment. I dont know which way to go. If deciding on a tankless, I am without hot water when grid power is out. It does happen, but not usually for very long. Just looking father down the road than just a days walk.