Question about Water Heaters

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Oil furnace only produces cool water intermittedly and only when heat is actively on

If furnace not actively running to produce heat it does not produce hot water for a shower. I do not have hard water but the furnace is 14 years old. Could the furnace hot water tank heating element need to be cleaned???? What other things could be wrong????? thankyou for your help. I do get my furnace serviced every year.

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For clarity, a Furnace produces HOT AIR for heat while a boiler produces HOT WATER for heat. Just remember...boil = water. You said your "furnace" does not produce hot water for a shower and because furnaces do not product hot water unless they have some model that do???? Usually people with a furnace have a seperate hot water heater. People with boilers though can produce hot water for use as both their sinks/showers hot water and their heat (by heating water that goes through baseboards) in their house. I don't believe any furnaces produce hot water most of the time a furnace just produces hot air for heating. So figure out what you first have.
Having said that, I'll assume you have a boiler like I do and my Weil McClean(sp?) stopped working a while back and wasn't turning on to "boil" any water. I took apart the burner and there is a light sensing photo resistor as part of the controls. If this phto resistor goes bad, the boiler will not start. The resister is cheap, I think it was $8 but you have to know what you're doing to change it. So you may be better to call someone who can work on such equipment.
Boiler's themselves are not overly complex. Home heating oil is the same diesel fuel that you can buy in a gas station only the government has "oil" companies put a RED die in home heating fuel which is usually cheaper then Diesel fuel because diesel fuel is taxed to death. The reason they do that is so that if you try putting RED tinted home heating fuel in your truck and you get pulled over (because you're a trucker with and 18 wheeler and they typically do inspections of these trucks) you will be a huge fine if they see you're running home heating fuel and NOT paying your taxed by purchasing Diesel fuel. A little bit of background so you know the fuel you are dealing with here. So it's dieslel fuel without the tax you run in your boiler. Gasoline on the other hand is VERY explosive as you know, but diesel fuel (if you're ever tried to light it) takes some coaxing to get lit. When it's cold out, diesel fuel is very hard to light and that's why trucks use glow plugs. You don't need those in your home though.
But because diesel fuel/home heating oil is hard to light, it's sprayed as a msit into your boiler, so that it can light more easily.
But because it is a fuel, you should know what you're doing when messing with it. FInd out what you have, and then have someone work on the issue if you haven't already. I'm guessing you have had it fixed by now?

Posted on Jun 29, 2014

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Posted on Jan 02, 2017

motor1258
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SOURCE: I have a GSW Series 5 water heater (electric). I

It may be one of 2 elements not working, a thermostat problem, scale build up in tank, to name a few possibilities. You'll need to shut off power to water heater before doing anything to it, and perform a few tests, and check a few things to determine which one is the cause. After power is off, you remove cover(s) on side of tank and peel back the insulation to get access to element(s). Keep in mind that should you need to change one of the elements, or both (assuming it has 2 otherwise you wouldn't have any hot water at all if only 1 element and not working.) This is where it would be good to have a voltage meter ( or multimeter ) and know how to use it. Is that possible? Before you reply, please shut off power and remove cover(s) to be sure whether single or dual element. If it's single, it may just be thermostat adjustment, or faulty, or scale build up around element. Keep in mind that water to tank will need to be shut off and tank drained down below element before removing/replacing. Get back to me with info on single or dual element. Thanks

Posted on Jan 10, 2011

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SOURCE: Combi Boiler - Running warm & then cold!? HELP!

mixing valve must be replaced

Posted on Nov 02, 2008

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SOURCE: 12-year old Rheem residential single-thermostat

TIME TO REPLACE TODAYS ARE MORE EFFICIENT

Posted on Sep 08, 2009

rick_stokes_
  • 61 Answers

SOURCE: warm water only

You can eliminate the shower control knob possibility by turning on your hot water anywhere else in the house. If you get hot water in other places, then it could be the knob causing it. A substantial lime buildup in the tank can also cause poor heat transfer from the elements to the water.

Posted on Sep 19, 2009

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SOURCE: Rheem 50 Gal two 4500W heating element - not enough hot water

one element is off peak and one is boost could be thermostat or ripple controller in fuse box or one dead element

Posted on Apr 21, 2010

Testimonial: "It is very good advice. I bought a tester to check out both upper and lowre thermostat and heating element; I've replaced the lower heating element "

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