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FAQ

how can a hot-water boiler heat water to 250 degrees F. and not boil the water ?

The boiler maintains a pressure greater than atmospheric pressure. The higher the pressure, the higher the boiling pint of water.

an option in many water-tube boilers is the usage of re-circulation pumps.please expalin in which cases/for which purpose is this reasonable?

Natural circulation boilers rely on the density difference of the hot and cold water in the boiler to circulate the boiler water through the tubes. Boilers with recirculating pumps force the water to circulate through the boiler tubes. This creates a more even heating in boiler tubes of different sizes, shapes, and lengths. It allows for faster heating at boiler start-up, larger overall boiler sizes, and more efficient usage of heating surfaces.

If a boiler (such as in a steam engine) is under pressure, then how is the water level maintained? Surely the water would have to be at an equal pressure to the steam inside the boiler.

Water is added to a boiler FIRST! (Get a lil experience and then it'll be funny!) Seriously though, yes, your boiler feed pump delivers water at a pressure exceeding that of the outlet steam pressure.

Our current boiler system is 28 years old, and likely to die at any minute.What's the cheapest you can get a new boiler for? It has to be a combi boiler by law, I think. It doesn't need to be particularly fancy, just as long as it will heat the radiators.UK only, please.

Also if you are having a combi boiler all the water used in the house will be coming direct from the mains as there is no storage tank in the house. Because of that you may find that you will also have to change your shower head (if you have one) as an older head may not be able to cope with the mains pressure.

I have a hydronic heating system and have recently bled my radiators (because there was a lot of clanging recently when the boiler turned on, so I was under the impression that that was because of a build-up of air in the pipes) So, I bled the radiators, and ever since then my boiler has not turned on. I also have lost all pressure (gauge reads zero). Wondering if the loss of pressure is a result of bleeding, and if so, how to I get back the pressure.

Underneath (usually) your boiler there will be a tap that tops up the pressure in your boiler. You need this to be around 1-1.5 bar. And yes bleeding the radiators will cause this problem. You will find that over a period of time the pressure will naturally drop so the clanging was likely the pressure already low. If you can't find the filling point check the boiler manual as sometimes there is one fitted to the boiler

boiler ton/hr

a boiler which can covert one ton of water in to saturated steam in one hour.

I have a Vokera combi boiler (excell SP 80) which is probably around 12 years old. Lately is has switched off for no apparent reason. Even though I have managed to switch it back on, what would you recommend to do : have it repaired or changed?Other question, when I asked for quotes to have it changed, the plumber told me that the gas pipe is too narrow and the gas pipes leading to the boiler need to be changed. This would entail major work, so my question is : shy should I have wider gas pipes fitted?Thanks in advance for all your answers

Newer boiler would be more efficient. I would get another bid though. wider gas lines? That sounds fishy. The gas supply line should be fine unless you increase the BTU's . But even then it should be fine.

pls can anyone tell me the efficiency of the boilers with super-heater and without superheaters..!

The boiler efficiency is roughly the same with and without superheat. The efficiency of a utility boiler will be over 90%. You obtain the efficiency savings in the turbine cycle where you convert the thermal energy of the steam into mechanical energy to turn a generator. In most modern coal fired boiler, there are two superheat circuits, one called superheat and one called reheat. The heat rate of one boiler I know of with the reheat circuit is over 13,000 BTU/KWHr, while the heat rate of a two superheat boiler is around 10,000 BTU/KWHr. (Divide the heat rate by 3412 to get the efficiency.) But it depends on design. Most nuclear units do not have any superheat, they operate on a saturated steam steam cycle. Their heat rates are not that far off from a coal unit, look at the figures in the link below: