When boilers were first developed, they were made of wrought iron. As boilers began to be used in steam engines, copper became an increasingly popular choice. Today, there are many different types of on the market. The majority of these are made of steel or a steel alloy though copper and brass are common as well in smaller boilers. Gas boilers prices vary based on material and efficiency.
Boilers have been the cause of many serious injuries in the past. They were often not engineered well and were composed of brittle metal which ruptured easily and were not welded well. The boilers of today are much safer but they still should be maintained well to ensure safety.
The first types of boilers to be used frequently were known as Haycock boilers or pot boilers. These boilers ran on wood or coal rather than gas and were not very efficient. They stored large amounts of low pressure steam. When steam engines were created, another option was needed. Fire-tube boilers were created. These were located inside the engine and were surrounded by water which insolated the gasses inside. They were traditionally powered with fire or steam but have been converted to run on gas for use today. Water-tube boilers are similar to the previously described boilers. They produce large amounts of steam due to the water tubes throughout the furnace but can store less. They run on any fuel source. Sometimes fire-tube and water-tube components are combined, but this has not been very successful. Sectional boilers are created in sections which each contain water. Again, these can run on any fuel source.
Manufacturers – A Variety of Gas Boilers Prices
Weil McLain
These boilers have a 93% efficiency rating and are contain a cast aluminum heat exchanger. The Venturi body gives it high efficiency and it is designed to work, even when used in low temperature areas. Weil McLain gas boilers prices are reasonable.
Lochinvar
The Knight series from Lochinvar offers customers the options of floor or wall mounted boilers. The efficiency of these boilers is up to 98.6% when running at low temperatures and 94.6% thermal efficiency.
Triangle
This manufacturer uses stainless steel heat exchangers and has a firing rate of 25%. The efficiency is 95% and it is available in five different sizes. If there are problems, troubleshooting is very easy with Triangle boilers. Triange gas boilers prices tend to be expensive
Buderus
These boilers have integrated controls which make them easy to use and feature a cast aluminum heat exchanger. These are great for people who are trying to save space since they are not large. Buderus gas boilers prices offer great value for money.
Viessmann
Viessmann boilers have very high efficiency ratings and come in various sizes which makes them easy to store. They also have wall-mounted options for further space saving convinenience. Viessman gas boilers prices are expesnive but they still offer great value for money due to thier high efficiency. 
Burnham
These boilers have great efficiency as well. The water is heated by stainless steel coils attached to the combustion chamber. The firing rates vary based on the amount of heat needed which further increases energy efficiency. Burnham gas boilers prices are are some of the cheapest in the business.
