Q:Total heat supply rate of the boiler to the steam?

Boilers are rated in horsepower. The pressure increase is about 1 lb for each 2 degrees rise in temperature over 212 degrees. the water input pressure must be above the boiler operating pressure,so a high pressure pump is used to push the water in. The more steam you take out the more water you must put back. If your recovery rate isn't high enough you run out of steam and pressure. I hope this answers your question.

Q:How many KW boiler will i need for 3 bed bungalow which will have 7 radiators about 95 sq meters of floor space

Where? how well insulated? the climate makes a difference

Q:what will happen if many boiler tubes are blind?

Edited In a high pressure water tube power boiler, if just a single boiler tube becomes even partially internally encrusted with a deposit, long before it becomes plugged or blind the metal at the location can become overheated and weakened to the point of failure. This is because the tube internal fouling (scaling) will act as an insulation to retard the heat of the fire from being transferred into the water. The water and steam actually cool the tube. These types of vertical, water (inside the) tube boilers are not constructed so that individual tubes can be intentionally plugged for operation. A deffective tube will be replaced during the boiler inspection and maintanence when it is out of service. Boiler feed water is treated to remove dissolved minerals so that there is nothing in it to deposit. Scaling is more of a concern with higher pressure power boilers. Scaling was and is not as much of a concern with the other style of horizontal fire tube power boilers and water heaters. Here the water surrounds the tubes. These were the older lower temperature boilers used with the saw mills, steam ships and railroads and are still common. Those tubes could be intentionally plugged if a leak was found. Of course the plugging of leaking tubes would reduce the boiler capacity.

Q:does any one know why?

Shut off the electrical switch from your heating unit then open the cover to your boiler check under the boiler if all the tubing where the fire goes is set properly on the slot in the back because if one of that tube was pitch down? that will cause to blow the pilot light every time the flame on the tube was shut off.Good luck....

Q:what is the purpose of providing fusible plug in boiler?

Fusible Plug

Q:The preasure relief keeps going off when boiler runs. It has a new expansion tank and a good preasure relief valve.

I would suggest the thermostat is stuck and don't cut out the heating element.

Q:I live in the UK, in a 1970's ex local authority semi and it has the standard 'back' boiler which was fitted to many homes built at that time. After the recent gas bill rises I decided to turn the boiler down to hopefully reduce my energy bills but discovered that the boiler is on setting 2 (out of 5) My question is, would it be better to turn it down to 1 of in fact turn it up to 3 or even 4 making it run hotter and therefore reduce the amount of cutting in and out it does to heat the water tank. Basically I only have hot water on gas (heating is off at the mo) and it seems to be costing me around ?1.50 a day which does seem quite expensive for a couple of showers and some washing up per day.

The hotter you keep your water, the more heat it will lose. The rate of heat loss is directly proportional to the difference in temperature between your boiler and the air around it. The number of times the burner cuts in and out is irrelevant; the only thing that matters is how long the burner is on in total. Answer: keep it as low as you can live with. More important to your heating costs is how much you let out the door (or the window or all of the other holes and cracks). If your water tank is not insulated, insulate it. Replace the weatherstrips on all your doors and windows. Caulk every crack or pin hole. If you can, double the amount of insulation in your attic. Think of your house as a slightly leaky pail, leaking your money -- i.e. your expensive heated air. Every pin hole you plug is money kept in your pocket.

Q:what do I need to know about my boiler?

theres water inside and it gets really hot

Q:Why boilers use softened water

Imagine, just six months to a year, you can scale 1 - 2mm. Scale of the great harm, serious, can cause the boiler burst! Scale and metal thermal performance comparison.

Q:im living in a four bedrom house with my wife, daughter and son, currently with a conventional boiler and a 3 bar power shower.What are the options?

. It looks like the 'combi' costs more but delivers more. The big advantage with a combination boiler, or a combi as it is usually called, is that it not only delivers continuous hot water, but more importantly delivers it at mains pressure too. So, with a combi system you can have a really effective shower without needing an expensive Power Shower booster pump. Combis are also considered to be amongst the easiest systems to install,..... Then there's this ...If you looking to replace your existing gas or oil central heating boiler, you should consider buying a Condensing Boiler. Although these typically cost ?100-?300 more to buy and install than a conventional modern boiler, they should save this extra cost in as little as 4 years. A condensing boiler is a high efficiency modern boiler that incorporates an extra heat exchanger so that the hot exhaust gases lose much of their energy to pre-heat the water in the boiler system. When working at peak efficiency, the water vapour produced in the combustion process condenses back into liquid form releasing the latent heat of vaporisation. A side effect is that this water, known as condensate, which is usually acidic, has to be piped away to a drain or soakaway. ... ... The musewell site is informative. I think I'd go with the combi.