low hot wtr pressure-no seperate heater

Old 05-23-07, 06:01 AM
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Question low hot wtr pressure-no seperate heater

Very little hot water pressure throughout house. Cold showers, long fill time in washer. But, unlike the other posts I've read...we only have a furnace, no seperate heater. Even worse in the winter when the heat is on. But there should be improvement now. Can we solve the problem w/out purchasing a seperate heater? We have the furnace maintained yearly. It is in good working order.
Please help
Old 05-26-07, 07:57 PM
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The age of your furnace may tell on you. If it has galvanized piping, the piping is probably occluded with rust. Water heaters aren't like buying a car, and I would pop for one in a minute if it meant getting a hot shower. Check the pipes and let us know what they are made of and the age of the system.
Old 05-26-07, 09:12 PM
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If your "furnace" supplies your hot water you have a boiler, not a furnace.

Your heat is by means of radiators, radiant floors or baseboard convectors, right?

Anyway, terminology aside what you have is known as a "tankless coil" and while there are thousands of them installed they are really a lousy way to supply domestic hot water.

More likely than not your tankless coil is either scale encrusted on the boiler side or it is scale encrusted on the domestic water side. Perhaps both.

You have several options. Replace the tankless coil, clean the tankless coil or abandon the tankless coil for a different method of heating your domestic water.

Removing the tankless coil from the boiler (necessary for cleaning or replacement) is a labor intensive project with the very real danger of breaking parts of the boiler. Cleaning of the coil is sometimes effective but it can also lead to leaking of the coil.

A new electric or gas water heater may be the simplest and least expensive initially but the installation of an indirect water heater that uses the boiler water to heat domestic water in a separate highly insulated tank will be the most cost effective for the long haul. Indirect heaters don't come cheap, they cost several times what a gas or electric water heater will cost but their operational costs are lower and they last almost forever.

Ther is one other possibility. Most tankless coils have a "tempering valve" installed that keeps the temperature of the supplied water within certain limits by blending water from the tankless coil outlet and the cold water supply. It is possible that this valve has failed or is very near to failure.

A couple of pictures posted to a photo hosting site with the URL posted here might help.

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