LPG boiler - pitfalls of use

An ideal option for heating a country or private house as an off-season heater would be boilers running on liquefied gas. The advantages of such boilers are high efficiency, economy and ease of use.

The liquefied bottled gas boiler has no fundamental differences in design, with the exception of special nozzles, which can often be supplied as a set.

The difference lies in the fact that the nozzles for such boilers are made taking into account the impact of a stronger working pressure.

Tip: it is better to leave the work on setting up the boiler to a specialist, even taking into account that they are available in the performance of the average man in the street. Thus, you can be sure that the master will do all the work correctly and guarantee the quality, as well as the safety of connecting the boiler.

Advantages and disadvantages of such equipment

Compared to other available heating options, liquefied bottled gas boilers have a number of undeniable advantages:

1. Independence from tariffs for housing and communal services and a centralized heating supply system.
2. The efficiency of boilers reaches 96%.
3. Versatility.

Versatility lies in the fact that the boiler can operate not only on a liquefied fuel source, but also on ordinary bottled gas. To do this, it is only worth changing the burner to a model with a smaller nozzle diameter.

Also, the second universal quality of such boilers is their functional practicality. That is, they can be used not only as a heating device, but also for heating water and other household needs.

There are also disadvantages

For all their "positivity" and convenience, these boilers also have some disadvantages, characterized by 2 points:

1. The process of connecting each cylinder is done manually and requires not only scrupulous care, but also caution from a safety point of view.
2. For full-fledged continuous operation, it is necessary to have several cylinders of liquefied gas in stock.

Recommendation of experts: it is better to allocate a special ventilated room for storage of cylinders, preferably with a separate exit. It is strictly forbidden to store cylinders in the basement or basement.

What must be taken into account when choosing equipment?

First of all, you need to decide what functions the boiler will perform.

There are 2 types of modifications: single-circuit and double-circuit. The first ones are intended only for heating, and the second ones also allow you to heat water, in addition to heating the room.

There are also differences in the method of installation: wall and floor models. The combustion chamber can also be of two types: open and closed. It all depends on the preferences and convenience of the user.

When buying equipment, the first thing to focus on is the quality characteristics:

• The equipment must operate under low pressure conditions. This will maximize the consumption of gas in the tank.
• Efficiency should be at the level of 90 -96%.

Equipment with such characteristics will be able to fully justify the expected demands for economy and efficiency (consumption - approximately 2 cylinders / week for heating an area of ​​100m 2).

In principle, if there is a boiler running on bottled gas on the farm, there is no need to buy another one. It is enough just to put nozzles with a smaller diameter and set up the automation system and fittings. For a greater guarantee of success, it is better to contact a specialist.

Calculation of the consumption of liquefied gas

When calculating the gas flow rate, one must be guided, first of all, by the evaporation surface area. The higher this indicator, the faster the liquid is converted to vapor.

The main indicators for calculating the consumption are the density, the calorific value of liquefied gas (0.52 kg / l and 23500 kJ, respectively) and the thermal energy that is released during the combustion of 1 liter of fuel (6.53 kWh).For greater clarity, it is worth taking the average cost of 1 liter of fuel (+\- 16 r) and the average cylinder displacement (around 42 l \u003d 22 kg) \u003d cost of 1 cylinder.

Average fuel consumption () - 0.12 kg / h per 1 kW of heat (boiler 12-15 kW) \u003d average 1.2-1.7 kg / h of fuel.

This is quite enough for heating an area up to 140 square meters.

Experts advise giving preference to horizontal devices, it is believed that they have more economical and productive benefits.

Connection diagrams for single-circuit and double-circuit boilers

Consider the scheme of a single-circuit boiler.

A diagram of a single-circuit boiler is given

In this embodiment, the coolant circulates through the space heating system and returns back, where it is reheated. Existence of an expansion tank and the safety valve is provided for release of pressure.

As for double-circuit boilers, the main difference is that it has two heat exchangers.

One serves for the heating system, and the other for domestic water supply. To a greater extent, they relate to wall-mounted liquefied gas boilers.

And they have a wiring diagram.

This is a two circuit diagram.

The location of 5 pipes inside is needed for (from left to right):

1. Hot coolant for the heating system.
2. Hot water for domestic hot water.
3. Pipe for gas.
4. Cold water for the heat exchanger, which will heat it for domestic hot water.
5. The heat carrier from the heating system, going to reheating.

Prices for boilers of domestic production

In general, the prices of liquefied gas boilers have a fairly wide range of variation.

It all depends on the power of the device and the needs of the user. But if we take average models for private use, then they are distinguished by their availability and relatively low cost.

As an example, we can cite such domestic models as AOGV 11.5 (120m 2,) - costing about 17,000 rubles, KSGV "LUCH" - from 10,000 rubles. or Ochag KSGV-12 SP - from 13,000 rubles.

Note: prices are at the time of writing - 2015.

The video below shows how to convert the Baxi Eco Compact boiler to LPG.

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