Combi Boiler Size Calculator

Choosing a combi boiler require you to understand that a combi boiler will perform two function at once. A combi boiler will provide heating to a home when the temperature within the home is low, and a combi boiler will also provide domestic hot water to the home when a person utilize a domestic hot water fixture within that home. Each of these function requires a combi boiler to have enough capacity to meet each of those demands.

Additionally, because a person may utilize both heating and domestic hot water at the same time, the combi boiler also must have enough capacity to meet these two demand simultaneously. Beyond the size of the home, the incoming water temperature to the home, as well as the numbers of domestic hot water fixtures that is utilized within the home, will determine the size of a combi boiler. Each of these home feature will impact the amount of heat that the home loses, which will impact the size of the combi boiler that is required to heat the home.

How to Choose the Right Combi Boiler

For instance, if the water that enters the home is very cold, the combi boiler will have to work harder to heat that water to the desired temperature. Additionally, if many people in the home utilize hot water from multiple domestic hot water fixture at the same time, the combi boiler will have to work harder to heat the water to the desired temperature. The heat loss calculation that are performed for a home will include a margin to account for the length of time that it take for the home to warm up after being exposed to cold temperature.

However, there is no warm up margin for domestic hot water; hot water demand begin upon the opening of any domestic hot water fixture. Thus, it is necessary to separately calculate the heating load for the home, the domestic hot water load for the home, and the simultaneous load for the home. The simultaneous load is the amount of heat that is required by the home if both the space heating and the domestic hot water system are being simultaneous utilized within the home.

If you calculate the largest single load for a home, but the simultaneous load is not accounted for, it is possible that the combi boiler will not have the necessary capacity to meet the demand of the home. The modulation depth of a combi boiler is another feature of a combi boiler that will impact its operation. Modulation refer to the ability of the combi boiler to adjust the amount of heat that the unit releases.

Combining the concept of modulation with modulation depth allow the combi boiler to adjust the firing rate of the combi boiler to a minimum rate. By being able to reduce the firing rate to a low level, the combi boiler will be able to run for longer period of time on mild days when little or no heat is needed. If, however, the firing rate of the combi boiler cannot be reduced to a low rate, the combi boiler will turn on and off very frequent within short periods of time.

These short periods of time when the combi boiler is continuously turning on and off are referred to as short cycling. Short cycling of a combi boiler waste both fuel and the component of the combi boiler over time. In addition to the factor discussed above, the physical factor of the home in which the combi boiler will be installed will also impact the performance of a combi boiler.

For instance, the length and diameter of the domestic hot water pipe will reduce the flow of domestic hot water that is delivered to the hot water fixture. Additionally, if the water that enters the home is very hard, the combi boiler will have to contend with the scale that will form within the heat exchanger of the combi boiler. This scale will reduce the efficiency of the combi boiler.

Finally, the location of the combi boiler will impact the way in which it can be accessed for service, as well as how the installer can install the venting for the combi boiler. The reference table located on the page will provide information regarding the heat loss rate for different type of homes, as well as the flow rate of domestic hot water that may leave the home based on the type of domestic hot water fixture in the home. By entering the specification of the home into the calculator that is located on the page, the calculator will provide the size of the combi boiler that is recommended for the home.

Furthermore, the output of the calculator will also indicate whether the size of the combi boiler was determined based off the heating load of the home, the domestic hot water load of the home, or if the size of the combi boiler was determined based upon the simultaneous load that is required of the home. Based upon the size of the combi boiler that is recommended for the home, a person can begin to create a shortlist of the different type of combi boilers that may be available for purchase. Each of these combi boiler will have a recommended size listed in the manufacturers rating table.

Thus, the recommended size that is calculated for the home can be compared to the size that are offered by the different combi boilers. Additionally, it is also necessary to ensure that the gas line and venting system for the home are compatible with the combi boilers that are listed on the shortlist. Finally, the person should also ensure the combi boilers that is considered for purchase meet any local building code for the area in which the combi boilers are to be install.

The goal of the step that are described above will be to ensure that a combi boiler is purchased that meet the largest demand that is placed upon the home. By purchasing a combi boiler that is too large for the home, however, the combi boiler will waste energy within the mild day of the year. By understanding the heating load for the home, the domestic hot water load for the home, and the importance of feature like modulation, a person will be able to logicaly select the correct combi boiler for that home.