Question

which of the following is not a drawback to tankless coils? the house boiler has to be kept hot all year long a tempering valve is usually necessary leaking coils can damage the house boiler these coils are prone to clogging with scale and rust a separate pump is needed for the coil question 34 1 pt low water pressure on the hot water side of a plumbing system may be related to the water heater because the dip tube may be missing the water heater adds considerably to the length of the distribution piping system sludge may obstruct the dip tube the flow of water is slowed because of the volume required to fill the tank the baffles or turbulator slow down the passage of the water

Explanation:

1. For the first question about tankless coils:

• Keeping the house - boiler hot all year long is a drawback as it consumes energy.
• A tempering valve is usually necessary which adds to the cost and complexity, a drawback.
• Leaking coils can damage the house - boiler, a significant drawback.
• Coils being prone to clogging with scale and rust is also a drawback.
• A separate pump is not always needed for tankless coils, so this is not a common drawback.

1. For the second question about low water pressure on the hot - water side:

• If the dip tube is missing, cold water can mix with hot water at the outlet, reducing the effective hot - water pressure.
• The length of the distribution piping system added by the water heater can cause some pressure drop, but it is not the most common reason.
• Sludge obstructing the dip tube can reduce the flow of water and thus the pressure.
• The volume required to fill the tank does not directly relate to low water pressure on the hot - water side.
• Baffles or turbulators are not the main cause of low water pressure on the hot - water side. The most common reason among the options is the missing dip tube.

Answer:

1. a separate pump is needed for the coil
2. the dip tube may be missing